Dario  Schaden

Dario Schaden

1625649720

Make YOUR OWN Programming Language - EP 12 - Multi-line statements

In this video we add multi-line statements to our language (for if, for, while and functions).

Please complete the poll on the video on what series I should make next!

Uncle Bob Clean Architecture book: https://read.amazon.co.uk/kp/embed?asin=B075LRM681&preview=newtab&linkCode=kpe&ref_=cm_sw_r_kb_dp_zbbTDb7E1P022&tag=davidcallanan-20 (affiliate link)

In the next episode we will be adding return, break and continue statements to functions and for loops.

Don’t forget to hit the like button if you enjoyed and leave a comment if you’ve got any problems.

LINKS

Python3 - https://www.python.org/downloads/
This series is loosely based on https://ruslanspivak.com/lsbasi-part1/

ALL CODE IS ON GITHUB

https://github.com/davidcallanan/py-basicinterp

Consider supporting me via PATREON

https://www.patreon.com/CodePulse

#python #your own programming language #multi-line statements

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Make YOUR OWN Programming Language - EP 12 - Multi-line statements

Swift Tips: A Collection Useful Tips for The Swift Language

SwiftTips

The following is a collection of tips I find to be useful when working with the Swift language. More content is available on my Twitter account!

Property Wrappers as Debugging Tools

Property Wrappers allow developers to wrap properties with specific behaviors, that will be seamlessly triggered whenever the properties are accessed.

While their primary use case is to implement business logic within our apps, it's also possible to use Property Wrappers as debugging tools!

For example, we could build a wrapper called @History, that would be added to a property while debugging and would keep track of all the values set to this property.

import Foundation

@propertyWrapper
struct History<Value> {
    private var value: Value
    private(set) var history: [Value] = []

    init(wrappedValue: Value) {
        self.value = wrappedValue
    }
    
    var wrappedValue: Value {
        get { value }

        set {
            history.append(value)
            value = newValue
        }
    }
    
    var projectedValue: Self {
        return self
    }
}

// We can then decorate our business code
// with the `@History` wrapper
struct User {
    @History var name: String = ""
}

var user = User()

// All the existing call sites will still
// compile, without the need for any change
user.name = "John"
user.name = "Jane"

// But now we can also access an history of
// all the previous values!
user.$name.history // ["", "John"]

Localization through String interpolation

Swift 5 gave us the possibility to define our own custom String interpolation methods.

This feature can be used to power many use cases, but there is one that is guaranteed to make sense in most projects: localizing user-facing strings.

import Foundation

extension String.StringInterpolation {
    mutating func appendInterpolation(localized key: String, _ args: CVarArg...) {
        let localized = String(format: NSLocalizedString(key, comment: ""), arguments: args)
        appendLiteral(localized)
    }
}


/*
 Let's assume that this is the content of our Localizable.strings:
 
 "welcome.screen.greetings" = "Hello %@!";
 */

let userName = "John"
print("\(localized: "welcome.screen.greetings", userName)") // Hello John!

Implementing pseudo-inheritance between structs

If you’ve always wanted to use some kind of inheritance mechanism for your structs, Swift 5.1 is going to make you very happy!

Using the new KeyPath-based dynamic member lookup, you can implement some pseudo-inheritance, where a type inherits the API of another one 🎉

(However, be careful, I’m definitely not advocating inheritance as a go-to solution 🙃)

import Foundation

protocol Inherits {
    associatedtype SuperType
    
    var `super`: SuperType { get }
}

extension Inherits {
    subscript<T>(dynamicMember keyPath: KeyPath<SuperType, T>) -> T {
        return self.`super`[keyPath: keyPath]
    }
}

struct Person {
    let name: String
}

@dynamicMemberLookup
struct User: Inherits {
    let `super`: Person
    
    let login: String
    let password: String
}

let user = User(super: Person(name: "John Appleseed"), login: "Johnny", password: "1234")

user.name // "John Appleseed"
user.login // "Johnny"

Composing NSAttributedString through a Function Builder

Swift 5.1 introduced Function Builders: a great tool for building custom DSL syntaxes, like SwiftUI. However, one doesn't need to be building a full-fledged DSL in order to leverage them.

For example, it's possible to write a simple Function Builder, whose job will be to compose together individual instances of NSAttributedString through a nicer syntax than the standard API.

import UIKit

@_functionBuilder
class NSAttributedStringBuilder {
    static func buildBlock(_ components: NSAttributedString...) -> NSAttributedString {
        let result = NSMutableAttributedString(string: "")
        
        return components.reduce(into: result) { (result, current) in result.append(current) }
    }
}

extension NSAttributedString {
    class func composing(@NSAttributedStringBuilder _ parts: () -> NSAttributedString) -> NSAttributedString {
        return parts()
    }
}

let result = NSAttributedString.composing {
    NSAttributedString(string: "Hello",
                       attributes: [.font: UIFont.systemFont(ofSize: 24),
                                    .foregroundColor: UIColor.red])
    NSAttributedString(string: " world!",
                       attributes: [.font: UIFont.systemFont(ofSize: 20),
                                    .foregroundColor: UIColor.orange])
}

Using switch and if as expressions

Contrary to other languages, like Kotlin, Swift does not allow switch and if to be used as expressions. Meaning that the following code is not valid Swift:

let constant = if condition {
                  someValue
               } else {
                  someOtherValue
               }

A common solution to this problem is to wrap the if or switch statement within a closure, that will then be immediately called. While this approach does manage to achieve the desired goal, it makes for a rather poor syntax.

To avoid the ugly trailing () and improve on the readability, you can define a resultOf function, that will serve the exact same purpose, in a more elegant way.

import Foundation

func resultOf<T>(_ code: () -> T) -> T {
    return code()
}

let randomInt = Int.random(in: 0...3)

let spelledOut: String = resultOf {
    switch randomInt {
    case 0:
        return "Zero"
    case 1:
        return "One"
    case 2:
        return "Two"
    case 3:
        return "Three"
    default:
        return "Out of range"
    }
}

print(spelledOut)

Avoiding double negatives within guard statements

A guard statement is a very convenient way for the developer to assert that a condition is met, in order for the execution of the program to keep going.

However, since the body of a guard statement is meant to be executed when the condition evaluates to false, the use of the negation (!) operator within the condition of a guard statement can make the code hard to read, as it becomes a double negative.

A nice trick to avoid such double negatives is to encapsulate the use of the ! operator within a new property or function, whose name does not include a negative.

import Foundation

extension Collection {
    var hasElements: Bool {
        return !isEmpty
    }
}

let array = Bool.random() ? [1, 2, 3] : []

guard array.hasElements else { fatalError("array was empty") }

print(array)

Defining a custom init without loosing the compiler-generated one

It's common knowledge for Swift developers that, when you define a struct, the compiler is going to automatically generate a memberwise init for you. That is, unless you also define an init of your own. Because then, the compiler won't generate any memberwise init.

Yet, there are many instances where we might enjoy the opportunity to get both. As it turns out, this goal is quite easy to achieve: you just need to define your own init in an extension rather than inside the type definition itself.

import Foundation

struct Point {
    let x: Int
    let y: Int
}

extension Point {
    init() {
        x = 0
        y = 0
    }
}

let usingDefaultInit = Point(x: 4, y: 3)
let usingCustomInit = Point()

Implementing a namespace through an empty enum

Swift does not really have an out-of-the-box support of namespaces. One could argue that a Swift module can be seen as a namespace, but creating a dedicated Framework for this sole purpose can legitimately be regarded as overkill.

Some developers have taken the habit to use a struct which only contains static fields to implement a namespace. While this does the job, it requires us to remember to implement an empty private init(), because it wouldn't make sense for such a struct to be instantiated.

It's actually possible to take this approach one step further, by replacing the struct with an enum. While it might seem weird to have an enum with no case, it's actually a very idiomatic way to declare a type that cannot be instantiated.

import Foundation

enum NumberFormatterProvider {
    static var currencyFormatter: NumberFormatter {
        let formatter = NumberFormatter()
        formatter.numberStyle = .currency
        formatter.roundingIncrement = 0.01
        return formatter
    }
    
    static var decimalFormatter: NumberFormatter {
        let formatter = NumberFormatter()
        formatter.numberStyle = .decimal
        formatter.decimalSeparator = ","
        return formatter
    }
}

NumberFormatterProvider() // ❌ impossible to instantiate by mistake

NumberFormatterProvider.currencyFormatter.string(from: 2.456) // $2.46
NumberFormatterProvider.decimalFormatter.string(from: 2.456) // 2,456

Using Never to represent impossible code paths

Never is quite a peculiar type in the Swift Standard Library: it is defined as an empty enum enum Never { }.

While this might seem odd at first glance, it actually yields a very interesting property: it makes it a type that cannot be constructed (i.e. it possesses no instances).

This way, Never can be used as a generic parameter to let the compiler know that a particular feature will not be used.

import Foundation

enum Result<Value, Error> {
    case success(value: Value)
    case failure(error: Error)
}

func willAlwaysSucceed(_ completion: @escaping ((Result<String, Never>) -> Void)) {
    completion(.success(value: "Call was successful"))
}

willAlwaysSucceed( { result in
    switch result {
    case .success(let value):
        print(value)
    // the compiler knows that the `failure` case cannot happen
    // so it doesn't require us to handle it.
    }
})

Providing a default value to a Decodable enum

Swift's Codable framework does a great job at seamlessly decoding entities from a JSON stream. However, when we integrate web-services, we are sometimes left to deal with JSONs that require behaviors that Codable does not provide out-of-the-box.

For instance, we might have a string-based or integer-based enum, and be required to set it to a default value when the data found in the JSON does not match any of its cases.

We might be tempted to implement this via an extensive switch statement over all the possible cases, but there is a much shorter alternative through the initializer init?(rawValue:):

import Foundation

enum State: String, Decodable {
    case active
    case inactive
    case undefined
    
    init(from decoder: Decoder) throws {
        let container = try decoder.singleValueContainer()
        let decodedString = try container.decode(String.self)
        
        self = State(rawValue: decodedString) ?? .undefined
    }
}

let data = """
["active", "inactive", "foo"]
""".data(using: .utf8)!

let decoded = try! JSONDecoder().decode([State].self, from: data)

print(decoded) // [State.active, State.inactive, State.undefined]

Another lightweight dependency injection through default values for function parameters

Dependency injection boils down to a simple idea: when an object requires a dependency, it shouldn't create it by itself, but instead it should be given a function that does it for him.

Now the great thing with Swift is that, not only can a function take another function as a parameter, but that parameter can also be given a default value.

When you combine both those features, you can end up with a dependency injection pattern that is both lightweight on boilerplate, but also type safe.

import Foundation

protocol Service {
    func call() -> String
}

class ProductionService: Service {
    func call() -> String {
        return "This is the production"
    }
}

class MockService: Service {
    func call() -> String {
        return "This is a mock"
    }
}

typealias Provider<T> = () -> T

class Controller {
    
    let service: Service
    
    init(serviceProvider: Provider<Service> = { return ProductionService() }) {
        self.service = serviceProvider()
    }
    
    func work() {
        print(service.call())
    }
}

let productionController = Controller()
productionController.work() // prints "This is the production"

let mockedController = Controller(serviceProvider: { return MockService() })
mockedController.work() // prints "This is a mock"

Lightweight dependency injection through protocol-oriented programming

Singletons are pretty bad. They make your architecture rigid and tightly coupled, which then results in your code being hard to test and refactor. Instead of using singletons, your code should rely on dependency injection, which is a much more architecturally sound approach.

But singletons are so easy to use, and dependency injection requires us to do extra-work. So maybe, for simple situations, we could find an in-between solution?

One possible solution is to rely on one of Swift's most know features: protocol-oriented programming. Using a protocol, we declare and access our dependency. We then store it in a private singleton, and perform the injection through an extension of said protocol.

This way, our code will indeed be decoupled from its dependency, while at the same time keeping the boilerplate to a minimum.

import Foundation

protocol Formatting {
    var formatter: NumberFormatter { get }
}

private let sharedFormatter: NumberFormatter = {
    let sharedFormatter = NumberFormatter()
    sharedFormatter.numberStyle = .currency
    return sharedFormatter
}()

extension Formatting {
    var formatter: NumberFormatter { return sharedFormatter }
}

class ViewModel: Formatting {
    var displayableAmount: String?
    
    func updateDisplay(to amount: Double) {
        displayableAmount = formatter.string(for: amount)
    }
}

let viewModel = ViewModel()

viewModel.updateDisplay(to: 42000.45)
viewModel.displayableAmount // "$42,000.45"

Getting rid of overabundant [weak self] and guard

Callbacks are a part of almost all iOS apps, and as frameworks such as RxSwift keep gaining in popularity, they become ever more present in our codebase.

Seasoned Swift developers are aware of the potential memory leaks that @escaping callbacks can produce, so they make real sure to always use [weak self], whenever they need to use self inside such a context. And when they need to have self be non-optional, they then add a guard statement along.

Consequently, this syntax of a [weak self] followed by a guard rapidly tends to appear everywhere in the codebase. The good thing is that, through a little protocol-oriented trick, it's actually possible to get rid of this tedious syntax, without loosing any of its benefits!

import Foundation
import PlaygroundSupport

PlaygroundPage.current.needsIndefiniteExecution = true

protocol Weakifiable: class { }

extension Weakifiable {
    func weakify(_ code: @escaping (Self) -> Void) -> () -> Void {
        return { [weak self] in
            guard let self = self else { return }
            
            code(self)
        }
    }
    
    func weakify<T>(_ code: @escaping (T, Self) -> Void) -> (T) -> Void {
        return { [weak self] arg in
            guard let self = self else { return }
            
            code(arg, self)
        }
    }
}

extension NSObject: Weakifiable { }

class Producer: NSObject {
    
    deinit {
        print("deinit Producer")
    }
    
    private var handler: (Int) -> Void = { _ in }
    
    func register(handler: @escaping (Int) -> Void) {
        self.handler = handler
        
        DispatchQueue.main.asyncAfter(deadline: .now() + 1.0, execute: { self.handler(42) })
    }
}

class Consumer: NSObject {
    
    deinit {
        print("deinit Consumer")
    }
    
    let producer = Producer()
    
    func consume() {
        producer.register(handler: weakify { result, strongSelf in
            strongSelf.handle(result)
        })
    }
    
    private func handle(_ result: Int) {
        print("🎉 \(result)")
    }
}

var consumer: Consumer? = Consumer()

consumer?.consume()

DispatchQueue.main.asyncAfter(deadline: .now() + 2.0, execute: { consumer = nil })

// This code prints:
// 🎉 42
// deinit Consumer
// deinit Producer

Solving callback hell with function composition

Asynchronous functions are a big part of iOS APIs, and most developers are familiar with the challenge they pose when one needs to sequentially call several asynchronous APIs.

This often results in callbacks being nested into one another, a predicament often referred to as callback hell.

Many third-party frameworks are able to tackle this issue, for instance RxSwift or PromiseKit. Yet, for simple instances of the problem, there is no need to use such big guns, as it can actually be solved with simple function composition.

import Foundation

typealias CompletionHandler<Result> = (Result?, Error?) -> Void

infix operator ~>: MultiplicationPrecedence

func ~> <T, U>(_ first: @escaping (CompletionHandler<T>) -> Void, _ second: @escaping (T, CompletionHandler<U>) -> Void) -> (CompletionHandler<U>) -> Void {
    return { completion in
        first({ firstResult, error in
            guard let firstResult = firstResult else { completion(nil, error); return }
            
            second(firstResult, { (secondResult, error) in
                completion(secondResult, error)
            })
        })
    }
}

func ~> <T, U>(_ first: @escaping (CompletionHandler<T>) -> Void, _ transform: @escaping (T) -> U) -> (CompletionHandler<U>) -> Void {
    return { completion in
        first({ result, error in
            guard let result = result else { completion(nil, error); return }
            
            completion(transform(result), nil)
        })
    }
}

func service1(_ completionHandler: CompletionHandler<Int>) {
    completionHandler(42, nil)
}

func service2(arg: String, _ completionHandler: CompletionHandler<String>) {
    completionHandler("🎉 \(arg)", nil)
}

let chainedServices = service1
    ~> { int in return String(int / 2) }
    ~> service2

chainedServices({ result, _ in
    guard let result = result else { return }
    
    print(result) // Prints: 🎉 21
})

Transform an asynchronous function into a synchronous one

Asynchronous functions are a great way to deal with future events without blocking a thread. Yet, there are times where we would like them to behave in exactly such a blocking way.

Think about writing unit tests and using mocked network calls. You will need to add complexity to your test in order to deal with asynchronous functions, whereas synchronous ones would be much easier to manage.

Thanks to Swift proficiency in the functional paradigm, it is possible to write a function whose job is to take an asynchronous function and transform it into a synchronous one.

import Foundation

func makeSynchrone<A, B>(_ asyncFunction: @escaping (A, (B) -> Void) -> Void) -> (A) -> B {
    return { arg in
        let lock = NSRecursiveLock()
        
        var result: B? = nil
        
        asyncFunction(arg) {
            result = $0
            lock.unlock()
        }
        
        lock.lock()
        
        return result!
    }
}

func myAsyncFunction(arg: Int, completionHandler: (String) -> Void) {
    completionHandler("🎉 \(arg)")
}

let syncFunction = makeSynchrone(myAsyncFunction)

print(syncFunction(42)) // prints 🎉 42

Using KeyPaths instead of closures

Closures are a great way to interact with generic APIs, for instance APIs that allow to manipulate data structures through the use of generic functions, such as filter() or sorted().

The annoying part is that closures tend to clutter your code with many instances of {, } and $0, which can quickly undermine its readably.

A nice alternative for a cleaner syntax is to use a KeyPath instead of a closure, along with an operator that will deal with transforming the provided KeyPath in a closure.

import Foundation

prefix operator ^

prefix func ^ <Element, Attribute>(_ keyPath: KeyPath<Element, Attribute>) -> (Element) -> Attribute {
    return { element in element[keyPath: keyPath] }
}

struct MyData {
    let int: Int
    let string: String
}

let data = [MyData(int: 2, string: "Foo"), MyData(int: 4, string: "Bar")]

data.map(^\.int) // [2, 4]
data.map(^\.string) // ["Foo", "Bar"]

Bringing some type-safety to a userInfo Dictionary

Many iOS APIs still rely on a userInfo Dictionary to handle use-case specific data. This Dictionary usually stores untyped values, and is declared as follows: [String: Any] (or sometimes [AnyHashable: Any].

Retrieving data from such a structure will involve some conditional casting (via the as? operator), which is prone to both errors and repetitions. Yet, by introducing a custom subscript, it's possible to encapsulate all the tedious logic, and end-up with an easier and more robust API.

import Foundation

typealias TypedUserInfoKey<T> = (key: String, type: T.Type)

extension Dictionary where Key == String, Value == Any {
    subscript<T>(_ typedKey: TypedUserInfoKey<T>) -> T? {
        return self[typedKey.key] as? T
    }
}

let userInfo: [String : Any] = ["Foo": 4, "Bar": "forty-two"]

let integerTypedKey = TypedUserInfoKey(key: "Foo", type: Int.self)
let intValue = userInfo[integerTypedKey] // returns 4
type(of: intValue) // returns Int?

let stringTypedKey = TypedUserInfoKey(key: "Bar", type: String.self)
let stringValue = userInfo[stringTypedKey] // returns "forty-two"
type(of: stringValue) // returns String?

Lightweight data-binding for an MVVM implementation

MVVM is a great pattern to separate business logic from presentation logic. The main challenge to make it work, is to define a mechanism for the presentation layer to be notified of model updates.

RxSwift is a perfect choice to solve such a problem. Yet, some developers don't feel confortable with leveraging a third-party library for such a central part of their architecture.

For those situation, it's possible to define a lightweight Variable type, that will make the MVVM pattern very easy to use!

import Foundation

class Variable<Value> {
    var value: Value {
        didSet {
            onUpdate?(value)
        }
    }
    
    var onUpdate: ((Value) -> Void)? {
        didSet {
            onUpdate?(value)
        }
    }
    
    init(_ value: Value, _ onUpdate: ((Value) -> Void)? = nil) {
        self.value = value
        self.onUpdate = onUpdate
        self.onUpdate?(value)
    }
}

let variable: Variable<String?> = Variable(nil)

variable.onUpdate = { data in
    if let data = data {
        print(data)
    }
}

variable.value = "Foo"
variable.value = "Bar"

// prints:
// Foo
// Bar

Using typealias to its fullest

The keyword typealias allows developers to give a new name to an already existing type. For instance, Swift defines Void as a typealias of (), the empty tuple.

But a less known feature of this mechanism is that it allows to assign concrete types for generic parameters, or to rename them. This can help make the semantics of generic types much clearer, when used in specific use cases.

import Foundation

enum Either<Left, Right> {
    case left(Left)
    case right(Right)
}

typealias Result<Value> = Either<Value, Error>

typealias IntOrString = Either<Int, String>

Writing an interruptible overload of forEach

Iterating through objects via the forEach(_:) method is a great alternative to the classic for loop, as it allows our code to be completely oblivious of the iteration logic. One limitation, however, is that forEach(_:) does not allow to stop the iteration midway.

Taking inspiration from the Objective-C implementation, we can write an overload that will allow the developer to stop the iteration, if needed.

import Foundation

extension Sequence {
    func forEach(_ body: (Element, _ stop: inout Bool) throws -> Void) rethrows {
        var stop = false
        for element in self {
            try body(element, &stop)
            
            if stop {
                return
            }
        }
    }
}

["Foo", "Bar", "FooBar"].forEach { element, stop in
    print(element)
    stop = (element == "Bar")
}

// Prints:
// Foo
// Bar

Optimizing the use of reduce()

Functional programing is a great way to simplify a codebase. For instance, reduce is an alternative to the classic for loop, without most the boilerplate. Unfortunately, simplicity often comes at the price of performance.

Consider that you want to remove duplicate values from a Sequence. While reduce() is a perfectly fine way to express this computation, the performance will be sub optimal, because of all the unnecessary Array copying that will happen every time its closure gets called.

That's when reduce(into:_:) comes into play. This version of reduce leverages the capacities of copy-on-write type (such as Array or Dictionnary) in order to avoid unnecessary copying, which results in a great performance boost.

import Foundation

func time(averagedExecutions: Int = 1, _ code: () -> Void) {
    let start = Date()
    for _ in 0..<averagedExecutions { code() }
    let end = Date()
    
    let duration = end.timeIntervalSince(start) / Double(averagedExecutions)
    
    print("time: \(duration)")
}

let data = (1...1_000).map { _ in Int(arc4random_uniform(256)) }


// runs in 0.63s
time {
    let noDuplicates: [Int] = data.reduce([], { $0.contains($1) ? $0 : $0 + [$1] })
}

// runs in 0.15s
time {
    let noDuplicates: [Int] = data.reduce(into: [], { if !$0.contains($1) { $0.append($1) } } )
}

Avoiding hardcoded reuse identifiers

UI components such as UITableView and UICollectionView rely on reuse identifiers in order to efficiently recycle the views they display. Often, those reuse identifiers take the form of a static hardcoded String, that will be used for every instance of their class.

Through protocol-oriented programing, it's possible to avoid those hardcoded values, and instead use the name of the type as a reuse identifier.

import Foundation
import UIKit

protocol Reusable {
    static var reuseIdentifier: String { get }
}

extension Reusable {
    static var reuseIdentifier: String {
        return String(describing: self)
    }
}

extension UITableViewCell: Reusable { }

extension UITableView {
    func register<T: UITableViewCell>(_ class: T.Type) {
        register(`class`, forCellReuseIdentifier: T.reuseIdentifier)
    }
    func dequeueReusableCell<T: UITableViewCell>(for indexPath: IndexPath) -> T {
        return dequeueReusableCell(withIdentifier: T.reuseIdentifier, for: indexPath) as! T
    }
}

class MyCell: UITableViewCell { }

let tableView = UITableView()

tableView.register(MyCell.self)
let myCell: MyCell = tableView.dequeueReusableCell(for: [0, 0])

Defining a union type

The C language has a construct called union, that allows a single variable to hold values from different types. While Swift does not provide such a construct, it provides enums with associated values, which allows us to define a type called Either that implements a union of two types.

import Foundation

enum Either<A, B> {
    case left(A)
    case right(B)
    
    func either(ifLeft: ((A) -> Void)? = nil, ifRight: ((B) -> Void)? = nil) {
        switch self {
        case let .left(a):
            ifLeft?(a)
        case let .right(b):
            ifRight?(b)
        }
    }
}

extension Bool { static func random() -> Bool { return arc4random_uniform(2) == 0 } }

var intOrString: Either<Int, String> = Bool.random() ? .left(2) : .right("Foo")

intOrString.either(ifLeft: { print($0 + 1) }, ifRight: { print($0 + "Bar") })

If you're interested by this kind of data structure, I strongly recommend that you learn more about Algebraic Data Types.

Asserting that classes have associated NIBs and vice-versa

Most of the time, when we create a .xib file, we give it the same name as its associated class. From that, if we later refactor our code and rename such a class, we run the risk of forgetting to rename the associated .xib.

While the error will often be easy to catch, if the .xib is used in a remote section of its app, it might go unnoticed for sometime. Fortunately it's possible to build custom test predicates that will assert that 1) for a given class, there exists a .nib with the same name in a given Bundle, 2) for all the .nib in a given Bundle, there exists a class with the same name.

import XCTest

public func XCTAssertClassHasNib(_ class: AnyClass, bundle: Bundle, file: StaticString = #file, line: UInt = #line) {
    let associatedNibURL = bundle.url(forResource: String(describing: `class`), withExtension: "nib")
    
    XCTAssertNotNil(associatedNibURL, "Class \"\(`class`)\" has no associated nib file", file: file, line: line)
}

public func XCTAssertNibHaveClasses(_ bundle: Bundle, file: StaticString = #file, line: UInt = #line) {
    guard let bundleName = bundle.infoDictionary?["CFBundleName"] as? String,
        let basePath = bundle.resourcePath,
        let enumerator = FileManager.default.enumerator(at: URL(fileURLWithPath: basePath),
                                                    includingPropertiesForKeys: nil,
                                                    options: [.skipsHiddenFiles, .skipsSubdirectoryDescendants]) else { return }
    
    var nibFilesURLs = [URL]()
    
    for case let fileURL as URL in enumerator {
        if fileURL.pathExtension.uppercased() == "NIB" {
            nibFilesURLs.append(fileURL)
        }
    }
    
    nibFilesURLs.map { $0.lastPathComponent }
        .compactMap { $0.split(separator: ".").first }
        .map { String($0) }
        .forEach {
            let associatedClass: AnyClass? = bundle.classNamed("\(bundleName).\($0)")
            
            XCTAssertNotNil(associatedClass, "File \"\($0).nib\" has no associated class", file: file, line: line)
        }
}

XCTAssertClassHasNib(MyFirstTableViewCell.self, bundle: Bundle(for: AppDelegate.self))
XCTAssertClassHasNib(MySecondTableViewCell.self, bundle: Bundle(for: AppDelegate.self))
        
XCTAssertNibHaveClasses(Bundle(for: AppDelegate.self))

Many thanks Benjamin Lavialle for coming up with the idea behind the second test predicate.

Small footprint type-erasing with functions

Seasoned Swift developers know it: a protocol with associated type (PAT) "can only be used as a generic constraint because it has Self or associated type requirements". When we really need to use a PAT to type a variable, the goto workaround is to use a type-erased wrapper.

While this solution works perfectly, it requires a fair amount of boilerplate code. In instances where we are only interested in exposing one particular function of the PAT, a shorter approach using function types is possible.

import Foundation
import UIKit

protocol Configurable {
    associatedtype Model
    
    func configure(with model: Model)
}

typealias Configurator<Model> = (Model) -> ()

extension UILabel: Configurable {
    func configure(with model: String) {
        self.text = model
    }
}

let label = UILabel()
let configurator: Configurator<String> = label.configure

configurator("Foo")

label.text // "Foo"

Performing animations sequentially

UIKit exposes a very powerful and simple API to perform view animations. However, this API can become a little bit quirky to use when we want to perform animations sequentially, because it involves nesting closure within one another, which produces notoriously hard to maintain code.

Nonetheless, it's possible to define a rather simple class, that will expose a really nicer API for this particular use case 👌

import Foundation
import UIKit

class AnimationSequence {
    typealias Animations = () -> Void
    
    private let current: Animations
    private let duration: TimeInterval
    private var next: AnimationSequence? = nil
    
    init(animations: @escaping Animations, duration: TimeInterval) {
        self.current = animations
        self.duration = duration
    }
    
    @discardableResult func append(animations: @escaping Animations, duration: TimeInterval) -> AnimationSequence {
        var lastAnimation = self
        while let nextAnimation = lastAnimation.next {
            lastAnimation = nextAnimation
        }
        lastAnimation.next = AnimationSequence(animations: animations, duration: duration)
        return self
    }
    
    func run() {
        UIView.animate(withDuration: duration, animations: current, completion: { finished in
            if finished, let next = self.next {
                next.run()
            }
        })
    }
}

var firstView = UIView()
var secondView = UIView()

firstView.alpha = 0
secondView.alpha = 0

AnimationSequence(animations: { firstView.alpha = 1.0 }, duration: 1)
            .append(animations: { secondView.alpha = 1.0 }, duration: 0.5)
            .append(animations: { firstView.alpha = 0.0 }, duration: 2.0)
            .run()

Debouncing a function call

Debouncing is a very useful tool when dealing with UI inputs. Consider a search bar, whose content is used to query an API. It wouldn't make sense to perform a request for every character the user is typing, because as soon as a new character is entered, the result of the previous request has become irrelevant.

Instead, our code will perform much better if we "debounce" the API call, meaning that we will wait until some delay has passed, without the input being modified, before actually performing the call.

import Foundation

func debounced(delay: TimeInterval, queue: DispatchQueue = .main, action: @escaping (() -> Void)) -> () -> Void {
    var workItem: DispatchWorkItem?
    
    return {
        workItem?.cancel()
        workItem = DispatchWorkItem(block: action)
        queue.asyncAfter(deadline: .now() + delay, execute: workItem!)
    }
}

let debouncedPrint = debounced(delay: 1.0) { print("Action performed!") }

debouncedPrint()
debouncedPrint()
debouncedPrint()

// After a 1 second delay, this gets
// printed only once to the console:

// Action performed!

Providing useful operators for Optional booleans

When we need to apply the standard boolean operators to Optional booleans, we often end up with a syntax unnecessarily crowded with unwrapping operations. By taking a cue from the world of three-valued logics, we can define a couple operators that make working with Bool? values much nicer.

import Foundation

func && (lhs: Bool?, rhs: Bool?) -> Bool? {
    switch (lhs, rhs) {
    case (false, _), (_, false):
        return false
    case let (unwrapLhs?, unwrapRhs?):
        return unwrapLhs && unwrapRhs
    default:
        return nil
    }
}

func || (lhs: Bool?, rhs: Bool?) -> Bool? {
    switch (lhs, rhs) {
    case (true, _), (_, true):
        return true
    case let (unwrapLhs?, unwrapRhs?):
        return unwrapLhs || unwrapRhs
    default:
        return nil
    }
}

false && nil // false
true && nil // nil
[true, nil, false].reduce(true, &&) // false

nil || true // true
nil || false // nil
[true, nil, false].reduce(false, ||) // true

Removing duplicate values from a Sequence

Transforming a Sequence in order to remove all the duplicate values it contains is a classic use case. To implement it, one could be tempted to transform the Sequence into a Set, then back to an Array. The downside with this approach is that it will not preserve the order of the sequence, which can definitely be a dealbreaker. Using reduce() it is possible to provide a concise implementation that preserves ordering:

import Foundation

extension Sequence where Element: Equatable {
    func duplicatesRemoved() -> [Element] {
        return reduce([], { $0.contains($1) ? $0 : $0 + [$1] })
    }
}

let data = [2, 5, 2, 3, 6, 5, 2]

data.duplicatesRemoved() // [2, 5, 3, 6]

Shorter syntax to deal with optional strings

Optional strings are very common in Swift code, for instance many objects from UIKit expose the text they display as a String?. Many times you will need to manipulate this data as an unwrapped String, with a default value set to the empty string for nil cases.

While the nil-coalescing operator (e.g. ??) is a perfectly fine way to a achieve this goal, defining a computed variable like orEmpty can help a lot in cleaning the syntax.

import Foundation
import UIKit

extension Optional where Wrapped == String {
    var orEmpty: String {
        switch self {
        case .some(let value):
            return value
        case .none:
            return ""
        }
    }
}

func doesNotWorkWithOptionalString(_ param: String) {
    // do something with `param`
}

let label = UILabel()
label.text = "This is some text."

doesNotWorkWithOptionalString(label.text.orEmpty)

Encapsulating background computation and UI update

Every seasoned iOS developers knows it: objects from UIKit can only be accessed from the main thread. Any attempt to access them from a background thread is a guaranteed crash.

Still, running a costly computation on the background, and then using it to update the UI can be a common pattern.

In such cases you can rely on asyncUI to encapsulate all the boilerplate code.

import Foundation
import UIKit

func asyncUI<T>(_ computation: @autoclosure @escaping () -> T, qos: DispatchQoS.QoSClass = .userInitiated, _ completion: @escaping (T) -> Void) {
    DispatchQueue.global(qos: qos).async {
        let value = computation()
        DispatchQueue.main.async {
            completion(value)
        }
    }
}

let label = UILabel()

func costlyComputation() -> Int { return (0..<10_000).reduce(0, +) }

asyncUI(costlyComputation()) { value in
    label.text = "\(value)"
}

Retrieving all the necessary data to build a debug view

A debug view, from which any controller of an app can be instantiated and pushed on the navigation stack, has the potential to bring some real value to a development process. A requirement to build such a view is to have a list of all the classes from a given Bundle that inherit from UIViewController. With the following extension, retrieving this list becomes a piece of cake 🍰

import Foundation
import UIKit
import ObjectiveC

extension Bundle {
    func viewControllerTypes() -> [UIViewController.Type] {
        guard let bundlePath = self.executablePath else { return [] }
        
        var size: UInt32 = 0
        var rawClassNames: UnsafeMutablePointer<UnsafePointer<Int8>>!
        var parsedClassNames = [String]()
        
        rawClassNames = objc_copyClassNamesForImage(bundlePath, &size)
        
        for index in 0..<size {
            let className = rawClassNames[Int(index)]
            
            if let name = NSString.init(utf8String:className) as String?,
                NSClassFromString(name) is UIViewController.Type {
                parsedClassNames.append(name)
            }
        }
        
        return parsedClassNames
            .sorted()
            .compactMap { NSClassFromString($0) as? UIViewController.Type }
    }
}

// Fetch all view controller types in UIKit
Bundle(for: UIViewController.self).viewControllerTypes()

I share the credit for this tip with Benoît Caron.

Defining a function to map over dictionaries

Update As it turns out, map is actually a really bad name for this function, because it does not preserve composition of transformations, a property that is required to fit the definition of a real map function.

Surprisingly enough, the standard library doesn't define a map() function for dictionaries that allows to map both keys and values into a new Dictionary. Nevertheless, such a function can be helpful, for instance when converting data across different frameworks.

import Foundation

extension Dictionary {
    func map<T: Hashable, U>(_ transform: (Key, Value) throws -> (T, U)) rethrows -> [T: U] {
        var result: [T: U] = [:]
        
        for (key, value) in self {
            let (transformedKey, transformedValue) = try transform(key, value)
            result[transformedKey] = transformedValue
        }
        
        return result
    }
}

let data = [0: 5, 1: 6, 2: 7]
data.map { ("\($0)", $1 * $1) } // ["2": 49, "0": 25, "1": 36]

A shorter syntax to remove nil values

Swift provides the function compactMap(), that can be used to remove nil values from a Sequence of optionals when calling it with an argument that just returns its parameter (i.e. compactMap { $0 }). Still, for such use cases it would be nice to get rid of the trailing closure.

The implementation isn't as straightforward as your usual extension, but once it has been written, the call site definitely gets cleaner 👌

import Foundation

protocol OptionalConvertible {
    associatedtype Wrapped
    func asOptional() -> Wrapped?
}

extension Optional: OptionalConvertible {
    func asOptional() -> Wrapped? {
        return self
    }
}

extension Sequence where Element: OptionalConvertible {
    func compacted() -> [Element.Wrapped] {
        return compactMap { $0.asOptional() }
    }
}

let data = [nil, 1, 2, nil, 3, 5, nil, 8, nil]
data.compacted() // [1, 2, 3, 5, 8]

Dealing with expirable values

It might happen that your code has to deal with values that come with an expiration date. In a game, it could be a score multiplier that will only last for 30 seconds. Or it could be an authentication token for an API, with a 15 minutes lifespan. In both instances you can rely on the type Expirable to encapsulate the expiration logic.

import Foundation

struct Expirable<T> {
    private var innerValue: T
    private(set) var expirationDate: Date
    
    var value: T? {
        return hasExpired() ? nil : innerValue
    }
    
    init(value: T, expirationDate: Date) {
        self.innerValue = value
        self.expirationDate = expirationDate
    }
    
    init(value: T, duration: Double) {
        self.innerValue = value
        self.expirationDate = Date().addingTimeInterval(duration)
    }
    
    func hasExpired() -> Bool {
        return expirationDate < Date()
    }
}

let expirable = Expirable(value: 42, duration: 3)

sleep(2)
expirable.value // 42
sleep(2)
expirable.value // nil

I share the credit for this tip with Benoît Caron.

Using parallelism to speed-up map()

Almost all Apple devices able to run Swift code are powered by a multi-core CPU, consequently making a good use of parallelism is a great way to improve code performance. map() is a perfect candidate for such an optimization, because it is almost trivial to define a parallel implementation.

import Foundation

extension Array {
    func parallelMap<T>(_ transform: (Element) -> T) -> [T] {
        let res = UnsafeMutablePointer<T>.allocate(capacity: count)
        
        DispatchQueue.concurrentPerform(iterations: count) { i in
            res[i] = transform(self[i])
        }
        
        let finalResult = Array<T>(UnsafeBufferPointer(start: res, count: count))
        res.deallocate(capacity: count)
        
        return finalResult
    }
}

let array = (0..<1_000).map { $0 }

func work(_ n: Int) -> Int {
    return (0..<n).reduce(0, +)
}

array.parallelMap { work($0) }

🚨 Make sure to only use parallelMap() when the transform function actually performs some costly computations. Otherwise performances will be systematically slower than using map(), because of the multithreading overhead.

Measuring execution time with minimum boilerplate

During development of a feature that performs some heavy computations, it can be helpful to measure just how much time a chunk of code takes to run. The time() function is a nice tool for this purpose, because of how simple it is to add and then to remove when it is no longer needed.

import Foundation

func time(averagedExecutions: Int = 1, _ code: () -> Void) {
    let start = Date()
    for _ in 0..<averagedExecutions { code() }
    let end = Date()
    
    let duration = end.timeIntervalSince(start) / Double(averagedExecutions)
    
    print("time: \(duration)")
}

time {
    (0...10_000).map { $0 * $0 }
}
// time: 0.183973908424377

Running two pieces of code in parallel

Concurrency is definitely one of those topics were the right encapsulation bears the potential to make your life so much easier. For instance, with this piece of code you can easily launch two computations in parallel, and have the results returned in a tuple.

import Foundation

func parallel<T, U>(_ left: @autoclosure () -> T, _ right: @autoclosure () -> U) -> (T, U) {
    var leftRes: T?
    var rightRes: U?
    
    DispatchQueue.concurrentPerform(iterations: 2, execute: { id in
        if id == 0 {
            leftRes = left()
        } else {
            rightRes = right()
        }
    })
    
    return (leftRes!, rightRes!)
}

let values = (1...100_000).map { $0 }

let results = parallel(values.map { $0 * $0 }, values.reduce(0, +))

Making good use of #file, #line and #function

Swift exposes three special variables #file, #line and #function, that are respectively set to the name of the current file, line and function. Those variables become very useful when writing custom logging functions or test predicates.

import Foundation

func log(_ message: String, _ file: String = #file, _ line: Int = #line, _ function: String = #function) {
    print("[\(file):\(line)] \(function) - \(message)")
}

func foo() {
    log("Hello world!")
}

foo() // [MyPlayground.playground:8] foo() - Hello world!

Comparing Optionals through Conditional Conformance

Swift 4.1 has introduced a new feature called Conditional Conformance, which allows a type to implement a protocol only when its generic type also does.

With this addition it becomes easy to let Optional implement Comparable only when Wrapped also implements Comparable:

import Foundation

extension Optional: Comparable where Wrapped: Comparable {
    public static func < (lhs: Optional, rhs: Optional) -> Bool {
        switch (lhs, rhs) {
        case let (lhs?, rhs?):
            return lhs < rhs
        case (nil, _?):
            return true // anything is greater than nil
        case (_?, nil):
            return false // nil in smaller than anything
        case (nil, nil):
            return true // nil is not smaller than itself
        }
    }
}

let data: [Int?] = [8, 4, 3, nil, 12, 4, 2, nil, -5]
data.sorted() // [nil, nil, Optional(-5), Optional(2), Optional(3), Optional(4), Optional(4), Optional(8), Optional(12)]

Safely subscripting a Collection

Any attempt to access an Array beyond its bounds will result in a crash. While it's possible to write conditions such as if index < array.count { array[index] } in order to prevent such crashes, this approach will rapidly become cumbersome.

A great thing is that this condition can be encapsulated in a custom subscript that will work on any Collection:

import Foundation

extension Collection {
    subscript (safe index: Index) -> Element? {
        return indices.contains(index) ? self[index] : nil
    }
}

let data = [1, 3, 4]

data[safe: 1] // Optional(3)
data[safe: 10] // nil

Easier String slicing using ranges

Subscripting a string with a range can be very cumbersome in Swift 4. Let's face it, no one wants to write lines like someString[index(startIndex, offsetBy: 0)..<index(startIndex, offsetBy: 10)] on a regular basis.

Luckily, with the addition of one clever extension, strings can be sliced as easily as arrays 🎉

import Foundation

extension String {
    public subscript(value: CountableClosedRange<Int>) -> Substring {
        get {
            return self[index(startIndex, offsetBy: value.lowerBound)...index(startIndex, offsetBy: value.upperBound)]
        }
    }
    
    public subscript(value: CountableRange<Int>) -> Substring {
        get {
            return self[index(startIndex, offsetBy: value.lowerBound)..<index(startIndex, offsetBy: value.upperBound)]
        }
    }
    
    public subscript(value: PartialRangeUpTo<Int>) -> Substring {
        get {
            return self[..<index(startIndex, offsetBy: value.upperBound)]
        }
    }
    
    public subscript(value: PartialRangeThrough<Int>) -> Substring {
        get {
            return self[...index(startIndex, offsetBy: value.upperBound)]
        }
    }
    
    public subscript(value: PartialRangeFrom<Int>) -> Substring {
        get {
            return self[index(startIndex, offsetBy: value.lowerBound)...]
        }
    }
}

let data = "This is a string!"

data[..<4]  // "This"
data[5..<9] // "is a"
data[10...] // "string!"

Concise syntax for sorting using a KeyPath

By using a KeyPath along with a generic type, a very clean and concise syntax for sorting data can be implemented:

import Foundation

extension Sequence {
    func sorted<T: Comparable>(by attribute: KeyPath<Element, T>) -> [Element] {
        return sorted(by: { $0[keyPath: attribute] < $1[keyPath: attribute] })
    }
}

let data = ["Some", "words", "of", "different", "lengths"]

data.sorted(by: \.count) // ["of", "Some", "words", "lengths", "different"]

If you like this syntax, make sure to checkout KeyPathKit!

Manufacturing cache-efficient versions of pure functions

By capturing a local variable in a returned closure, it is possible to manufacture cache-efficient versions of pure functions. Be careful though, this trick only works with non-recursive function!

import Foundation

func cached<In: Hashable, Out>(_ f: @escaping (In) -> Out) -> (In) -> Out {
    var cache = [In: Out]()
    
    return { (input: In) -> Out in
        if let cachedValue = cache[input] {
            return cachedValue
        } else {
            let result = f(input)
            cache[input] = result
            return result
        }
    }
}

let cachedCos = cached { (x: Double) in cos(x) }

cachedCos(.pi * 2) // value of cos for 2π is now cached

Simplifying complex conditions with pattern matching

When distinguishing between complex boolean conditions, using a switch statement along with pattern matching can be more readable than the classic series of if {} else if {}.

import Foundation

let expr1: Bool
let expr2: Bool
let expr3: Bool

if expr1 && !expr3 {
    functionA()
} else if !expr2 && expr3 {
    functionB()
} else if expr1 && !expr2 && expr3 {
    functionC()
}

switch (expr1, expr2, expr3) {
    
case (true, _, false):
    functionA()
case (_, false, true):
    functionB()
case (true, false, true):
    functionC()
default:
    break
}

Easily generating arrays of data

Using map() on a range makes it easy to generate an array of data.

import Foundation

func randomInt() -> Int { return Int(arc4random()) }

let randomArray = (1...10).map { _ in randomInt() }

Using @autoclosure for cleaner call sites

Using @autoclosure enables the compiler to automatically wrap an argument within a closure, thus allowing for a very clean syntax at call sites.

import UIKit

extension UIView {
    class func animate(withDuration duration: TimeInterval, _ animations: @escaping @autoclosure () -> Void) {
        UIView.animate(withDuration: duration, animations: animations)
    }
}

let view = UIView()

UIView.animate(withDuration: 0.3, view.backgroundColor = .orange)

Observing new and old value with RxSwift

When working with RxSwift, it's very easy to observe both the current and previous value of an observable sequence by simply introducing a shift using skip().

import RxSwift

let values = Observable.of(4, 8, 15, 16, 23, 42)

let newAndOld = Observable.zip(values, values.skip(1)) { (previous: $0, current: $1) }
    .subscribe(onNext: { pair in
        print("current: \(pair.current) - previous: \(pair.previous)")
    })

//current: 8 - previous: 4
//current: 15 - previous: 8
//current: 16 - previous: 15
//current: 23 - previous: 16
//current: 42 - previous: 23

Implicit initialization from literal values

Using protocols such as ExpressibleByStringLiteral it is possible to provide an init that will be automatically when a literal value is provided, allowing for nice and short syntax. This can be very helpful when writing mock or test data.

import Foundation

extension URL: ExpressibleByStringLiteral {
    public init(stringLiteral value: String) {
        self.init(string: value)!
    }
}

let url: URL = "http://www.google.fr"

NSURLConnection.canHandle(URLRequest(url: "http://www.google.fr"))

Achieving systematic validation of data

Through some clever use of Swift private visibility it is possible to define a container that holds any untrusted value (such as a user input) from which the only way to retrieve the value is by making it successfully pass a validation test.

import Foundation

struct Untrusted<T> {
    private(set) var value: T
}

protocol Validator {
    associatedtype T
    static func validation(value: T) -> Bool
}

extension Validator {
    static func validate(untrusted: Untrusted<T>) -> T? {
        if self.validation(value: untrusted.value) {
            return untrusted.value
        } else {
            return nil
        }
    }
}

struct FrenchPhoneNumberValidator: Validator {
    static func validation(value: String) -> Bool {
       return (value.count) == 10 && CharacterSet(charactersIn: value).isSubset(of: CharacterSet.decimalDigits)
    }
}

let validInput = Untrusted(value: "0122334455")
let invalidInput = Untrusted(value: "0123")

FrenchPhoneNumberValidator.validate(untrusted: validInput) // returns "0122334455"
FrenchPhoneNumberValidator.validate(untrusted: invalidInput) // returns nil

Implementing the builder pattern with keypaths

With the addition of keypaths in Swift 4, it is now possible to easily implement the builder pattern, that allows the developer to clearly separate the code that initializes a value from the code that uses it, without the burden of defining a factory method.

import UIKit

protocol With {}

extension With where Self: AnyObject {
    @discardableResult
    func with<T>(_ property: ReferenceWritableKeyPath<Self, T>, setTo value: T) -> Self {
        self[keyPath: property] = value
        return self
    }
}

extension UIView: With {}

let view = UIView()

let label = UILabel()
    .with(\.textColor, setTo: .red)
    .with(\.text, setTo: "Foo")
    .with(\.textAlignment, setTo: .right)
    .with(\.layer.cornerRadius, setTo: 5)

view.addSubview(label)

🚨 The Swift compiler does not perform OS availability checks on properties referenced by keypaths. Any attempt to use a KeyPath for an unavailable property will result in a runtime crash.

I share the credit for this tip with Marion Curtil.

Storing functions rather than values

When a type stores values for the sole purpose of parametrizing its functions, it’s then possible to not store the values but directly the function, with no discernable difference at the call site.

import Foundation

struct MaxValidator {
    let max: Int
    let strictComparison: Bool
    
    func isValid(_ value: Int) -> Bool {
        return self.strictComparison ? value < self.max : value <= self.max
    }
}

struct MaxValidator2 {
    var isValid: (_ value: Int) -> Bool
    
    init(max: Int, strictComparison: Bool) {
        self.isValid = strictComparison ? { $0 < max } : { $0 <= max }
    }
}

MaxValidator(max: 5, strictComparison: true).isValid(5) // false
MaxValidator2(max: 5, strictComparison: false).isValid(5) // true

Defining operators on function types

Functions are first-class citizen types in Swift, so it is perfectly legal to define operators for them.

import Foundation

let firstRange = { (0...3).contains($0) }
let secondRange = { (5...6).contains($0) }

func ||(_ lhs: @escaping (Int) -> Bool, _ rhs: @escaping (Int) -> Bool) -> (Int) -> Bool {
    return { value in
        return lhs(value) || rhs(value)
    }
}

(firstRange || secondRange)(2) // true
(firstRange || secondRange)(4) // false
(firstRange || secondRange)(6) // true

Typealiases for functions

Typealiases are great to express function signatures in a more comprehensive manner, which then enables us to easily define functions that operate on them, resulting in a nice way to write and use some powerful API.

import Foundation

typealias RangeSet = (Int) -> Bool

func union(_ left: @escaping RangeSet, _ right: @escaping RangeSet) -> RangeSet {
    return { left($0) || right($0) }
}

let firstRange = { (0...3).contains($0) }
let secondRange = { (5...6).contains($0) }

let unionRange = union(firstRange, secondRange)

unionRange(2) // true
unionRange(4) // false

Encapsulating state within a function

By returning a closure that captures a local variable, it's possible to encapsulate a mutable state within a function.

import Foundation

func counterFactory() -> () -> Int {
    var counter = 0
    
    return {
        counter += 1
        return counter
    }
}

let counter = counterFactory()

counter() // returns 1
counter() // returns 2

Generating all cases for an Enum

⚠️ Since Swift 4.2, allCases can now be synthesized at compile-time by simply conforming to the protocol CaseIterable. The implementation below should no longer be used in production code.

Through some clever leveraging of how enums are stored in memory, it is possible to generate an array that contains all the possible cases of an enum. This can prove particularly useful when writing unit tests that consume random data.

import Foundation

enum MyEnum { case first; case second; case third; case fourth }

protocol EnumCollection: Hashable {
    static var allCases: [Self] { get }
}

extension EnumCollection {
    public static var allCases: [Self] {
        var i = 0
        return Array(AnyIterator {
            let next = withUnsafePointer(to: &i) {
                $0.withMemoryRebound(to: Self.self, capacity: 1) { $0.pointee }
            }
            if next.hashValue != i { return nil }
            i += 1
            return next
        })
    }
}

extension MyEnum: EnumCollection { }

MyEnum.allCases // [.first, .second, .third, .fourth]

Using map on optional values

The if-let syntax is a great way to deal with optional values in a safe manner, but at times it can prove to be just a little bit to cumbersome. In such cases, using the Optional.map() function is a nice way to achieve a shorter code while retaining safeness and readability.

import UIKit

let date: Date? = Date() // or could be nil, doesn't matter
let formatter = DateFormatter()
let label = UILabel()

if let safeDate = date {
    label.text = formatter.string(from: safeDate)
}

label.text = date.map { return formatter.string(from: $0) }

label.text = date.map(formatter.string(from:)) // even shorter, tough less readable

📣 NEW 📣 Swift Tips are now available on YouTube 👇

Summary

Tips


Download Details:

Author: vincent-pradeilles
Source code: https://github.com/vincent-pradeilles/swift-tips

License: MIT license
#swift 

Dario  Schaden

Dario Schaden

1625649720

Make YOUR OWN Programming Language - EP 12 - Multi-line statements

In this video we add multi-line statements to our language (for if, for, while and functions).

Please complete the poll on the video on what series I should make next!

Uncle Bob Clean Architecture book: https://read.amazon.co.uk/kp/embed?asin=B075LRM681&preview=newtab&linkCode=kpe&ref_=cm_sw_r_kb_dp_zbbTDb7E1P022&tag=davidcallanan-20 (affiliate link)

In the next episode we will be adding return, break and continue statements to functions and for loops.

Don’t forget to hit the like button if you enjoyed and leave a comment if you’ve got any problems.

LINKS

Python3 - https://www.python.org/downloads/
This series is loosely based on https://ruslanspivak.com/lsbasi-part1/

ALL CODE IS ON GITHUB

https://github.com/davidcallanan/py-basicinterp

Consider supporting me via PATREON

https://www.patreon.com/CodePulse

#python #your own programming language #multi-line statements

Adaline  Kulas

Adaline Kulas

1594162500

Multi-cloud Spending: 8 Tips To Lower Cost

A multi-cloud approach is nothing but leveraging two or more cloud platforms for meeting the various business requirements of an enterprise. The multi-cloud IT environment incorporates different clouds from multiple vendors and negates the dependence on a single public cloud service provider. Thus enterprises can choose specific services from multiple public clouds and reap the benefits of each.

Given its affordability and agility, most enterprises opt for a multi-cloud approach in cloud computing now. A 2018 survey on the public cloud services market points out that 81% of the respondents use services from two or more providers. Subsequently, the cloud computing services market has reported incredible growth in recent times. The worldwide public cloud services market is all set to reach $500 billion in the next four years, according to IDC.

By choosing multi-cloud solutions strategically, enterprises can optimize the benefits of cloud computing and aim for some key competitive advantages. They can avoid the lengthy and cumbersome processes involved in buying, installing and testing high-priced systems. The IaaS and PaaS solutions have become a windfall for the enterprise’s budget as it does not incur huge up-front capital expenditure.

However, cost optimization is still a challenge while facilitating a multi-cloud environment and a large number of enterprises end up overpaying with or without realizing it. The below-mentioned tips would help you ensure the money is spent wisely on cloud computing services.

  • Deactivate underused or unattached resources

Most organizations tend to get wrong with simple things which turn out to be the root cause for needless spending and resource wastage. The first step to cost optimization in your cloud strategy is to identify underutilized resources that you have been paying for.

Enterprises often continue to pay for resources that have been purchased earlier but are no longer useful. Identifying such unused and unattached resources and deactivating it on a regular basis brings you one step closer to cost optimization. If needed, you can deploy automated cloud management tools that are largely helpful in providing the analytics needed to optimize the cloud spending and cut costs on an ongoing basis.

  • Figure out idle instances

Another key cost optimization strategy is to identify the idle computing instances and consolidate them into fewer instances. An idle computing instance may require a CPU utilization level of 1-5%, but you may be billed by the service provider for 100% for the same instance.

Every enterprise will have such non-production instances that constitute unnecessary storage space and lead to overpaying. Re-evaluating your resource allocations regularly and removing unnecessary storage may help you save money significantly. Resource allocation is not only a matter of CPU and memory but also it is linked to the storage, network, and various other factors.

  • Deploy monitoring mechanisms

The key to efficient cost reduction in cloud computing technology lies in proactive monitoring. A comprehensive view of the cloud usage helps enterprises to monitor and minimize unnecessary spending. You can make use of various mechanisms for monitoring computing demand.

For instance, you can use a heatmap to understand the highs and lows in computing visually. This heat map indicates the start and stop times which in turn lead to reduced costs. You can also deploy automated tools that help organizations to schedule instances to start and stop. By following a heatmap, you can understand whether it is safe to shut down servers on holidays or weekends.

#cloud computing services #all #hybrid cloud #cloud #multi-cloud strategy #cloud spend #multi-cloud spending #multi cloud adoption #why multi cloud #multi cloud trends #multi cloud companies #multi cloud research #multi cloud market

Nat  Grady

Nat Grady

1658734620

Chromium-net-errors: Chromium Network Errors for Node.js

Chromium Network Errors

Provides Chromium network errors found in net_error_list.h as custom error classes that can be conveniently used in Node.js, Electron apps and browsers.

The errors correspond to the error codes that are provided in Electron's did-fail-load events of the WebContents class and the webview tag.

Features

  • No dependencies.
  • 100% test coverage.
  • ES6 build with import and export, and a CommonJS build. Your bundler can use the ES6 modules if it supports the "module" or "jsnext:main" directives in the package.json.
  • Daily cron-triggered checks for updates on net_error_list.h on Travis CI to always get the most up-to-date list of errors.

Installation

npm install chromium-net-errors --save
import * as chromiumNetErrors from 'chromium-net-errors';
// or
const chromiumNetErrors = require('chromium-net-errors');

Example Use in Electron

import { app, BrowserWindow } from 'electron';
import * as chromiumNetErrors from 'chromium-net-errors';

app.on('ready', () => {
  const win = new BrowserWindow({
    width: 800,
    height: 600,
  });

  win.webContents.on('did-fail-load', (event) => {
    try {
      const Err = chromiumNetErrors.getErrorByCode(event.errorCode);
      throw new Err();
    } catch (err) {
      if (err instanceof chromiumNetErrors.NameNotResolvedError) {
        console.error(`The name '${event.validatedURL}' could not be resolved:\n  ${err.message}`);
      } else {
        console.error(`Something went wrong while loading ${event.validatedURL}`);
      }
    }
  });

  win.loadURL('http://blablanotexist.com');
});

Usage

import * as chromiumNetErrors from 'chromium-net-errors';

Create New Errors

const err = new chromiumNetErrors.ConnectionTimedOutError();

console.log(err instanceof Error);
// true
console.log(err instanceof chromiumNetErrors.ChromiumNetError);
// true
console.log(err instanceof chromiumNetErrors.ConnectionTimedOutError);
// true
function thrower() {
  throw new chromiumNetErrors.ConnectionTimedOutError();
}

try {
  thrower();
} catch (err) {
  console.log(err instanceof Error);
  // true
  console.log(err instanceof chromiumNetErrors.ChromiumNetError);
  // true
  console.log(err instanceof chromiumNetErrors.ConnectionTimedOutError);
  // true
}

Get Error by errorCode

Get the class of an error by its errorCode.

const Err = chromiumNetErrors.getErrorByCode(-201);
const err = new Err();

console.log(err instanceof chromiumNetErrors.CertDateInvalidError);
// true

console.log(err.isCertificateError());
// true

console.log(err.type); 
// 'certificate'

console.log(err.message);
// The server responded with a certificate that, by our clock, appears to
// either not yet be valid or to have expired. This could mean:
// 
// 1. An attacker is presenting an old certificate for which they have
// managed to obtain the private key.
// 
// 2. The server is misconfigured and is not presenting a valid cert.
// 
// 3. Our clock is wrong.

Get Error by errorDescription

Get the class of an error by its errorDescription.

const Err = chromiumNetErrors.getErrorByDescription('CERT_DATE_INVALID');
const err = new Err();

console.log(err instanceof chromiumNetErrors.CertDateInvalidError);
// true

console.log(err.isCertificateError());
// true

console.log(err.type); 
// 'certificate'

console.log(err.message);
// The server responded with a certificate that, by our clock, appears to
// either not yet be valid or to have expired. This could mean:
// 
// 1. An attacker is presenting an old certificate for which they have
// managed to obtain the private key.
// 
// 2. The server is misconfigured and is not presenting a valid cert.
// 
// 3. Our clock is wrong.

Get All Errors

Get an array of all possible errors.

console.log(chromiumNetErrors.getErrors());

// [ { name: 'IoPendingError',
//     code: -1,
//     description: 'IO_PENDING',
//     type: 'system',
//     message: 'An asynchronous IO operation is not yet complete.  This usually does not\nindicate a fatal error.  Typically this error will be generated as a\nnotification to wait for some external notification that the IO operation\nfinally completed.' },
//   { name: 'FailedError',
//     code: -2,
//     description: 'FAILED',
//     type: 'system',
//     message: 'A generic failure occurred.' },
//   { name: 'AbortedError',
//     code: -3,
//     description: 'ABORTED',
//     type: 'system',
//     message: 'An operation was aborted (due to user action).' },
//   { name: 'InvalidArgumentError',
//     code: -4,
//     description: 'INVALID_ARGUMENT',
//     type: 'system',
//     message: 'An argument to the function is incorrect.' },
//   { name: 'InvalidHandleError',
//     code: -5,
//     description: 'INVALID_HANDLE',
//     type: 'system',
//     message: 'The handle or file descriptor is invalid.' },
//   ...
// ]

List of Errors

IoPendingError

An asynchronous IO operation is not yet complete. This usually does not indicate a fatal error. Typically this error will be generated as a notification to wait for some external notification that the IO operation finally completed.

  • Name: IoPendingError
  • Code: -1
  • Description: IO_PENDING
  • Type: system
const err = new chromiumNetErrors.IoPendingError();
// or
const Err = chromiumNetErrors.getErrorByCode(-1);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('IO_PENDING');
const err = new Err();

FailedError

A generic failure occurred.

  • Name: FailedError
  • Code: -2
  • Description: FAILED
  • Type: system
const err = new chromiumNetErrors.FailedError();
// or
const Err = chromiumNetErrors.getErrorByCode(-2);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('FAILED');
const err = new Err();

AbortedError

An operation was aborted (due to user action).

  • Name: AbortedError
  • Code: -3
  • Description: ABORTED
  • Type: system
const err = new chromiumNetErrors.AbortedError();
// or
const Err = chromiumNetErrors.getErrorByCode(-3);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('ABORTED');
const err = new Err();

InvalidArgumentError

An argument to the function is incorrect.

  • Name: InvalidArgumentError
  • Code: -4
  • Description: INVALID_ARGUMENT
  • Type: system
const err = new chromiumNetErrors.InvalidArgumentError();
// or
const Err = chromiumNetErrors.getErrorByCode(-4);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('INVALID_ARGUMENT');
const err = new Err();

InvalidHandleError

The handle or file descriptor is invalid.

  • Name: InvalidHandleError
  • Code: -5
  • Description: INVALID_HANDLE
  • Type: system
const err = new chromiumNetErrors.InvalidHandleError();
// or
const Err = chromiumNetErrors.getErrorByCode(-5);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('INVALID_HANDLE');
const err = new Err();

FileNotFoundError

The file or directory cannot be found.

  • Name: FileNotFoundError
  • Code: -6
  • Description: FILE_NOT_FOUND
  • Type: system
const err = new chromiumNetErrors.FileNotFoundError();
// or
const Err = chromiumNetErrors.getErrorByCode(-6);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('FILE_NOT_FOUND');
const err = new Err();

TimedOutError

An operation timed out.

  • Name: TimedOutError
  • Code: -7
  • Description: TIMED_OUT
  • Type: system
const err = new chromiumNetErrors.TimedOutError();
// or
const Err = chromiumNetErrors.getErrorByCode(-7);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('TIMED_OUT');
const err = new Err();

FileTooBigError

The file is too large.

  • Name: FileTooBigError
  • Code: -8
  • Description: FILE_TOO_BIG
  • Type: system
const err = new chromiumNetErrors.FileTooBigError();
// or
const Err = chromiumNetErrors.getErrorByCode(-8);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('FILE_TOO_BIG');
const err = new Err();

UnexpectedError

An unexpected error. This may be caused by a programming mistake or an invalid assumption.

  • Name: UnexpectedError
  • Code: -9
  • Description: UNEXPECTED
  • Type: system
const err = new chromiumNetErrors.UnexpectedError();
// or
const Err = chromiumNetErrors.getErrorByCode(-9);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('UNEXPECTED');
const err = new Err();

AccessDeniedError

Permission to access a resource, other than the network, was denied.

  • Name: AccessDeniedError
  • Code: -10
  • Description: ACCESS_DENIED
  • Type: system
const err = new chromiumNetErrors.AccessDeniedError();
// or
const Err = chromiumNetErrors.getErrorByCode(-10);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('ACCESS_DENIED');
const err = new Err();

NotImplementedError

The operation failed because of unimplemented functionality.

  • Name: NotImplementedError
  • Code: -11
  • Description: NOT_IMPLEMENTED
  • Type: system
const err = new chromiumNetErrors.NotImplementedError();
// or
const Err = chromiumNetErrors.getErrorByCode(-11);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('NOT_IMPLEMENTED');
const err = new Err();

InsufficientResourcesError

There were not enough resources to complete the operation.

  • Name: InsufficientResourcesError
  • Code: -12
  • Description: INSUFFICIENT_RESOURCES
  • Type: system
const err = new chromiumNetErrors.InsufficientResourcesError();
// or
const Err = chromiumNetErrors.getErrorByCode(-12);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('INSUFFICIENT_RESOURCES');
const err = new Err();

OutOfMemoryError

Memory allocation failed.

  • Name: OutOfMemoryError
  • Code: -13
  • Description: OUT_OF_MEMORY
  • Type: system
const err = new chromiumNetErrors.OutOfMemoryError();
// or
const Err = chromiumNetErrors.getErrorByCode(-13);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('OUT_OF_MEMORY');
const err = new Err();

UploadFileChangedError

The file upload failed because the file's modification time was different from the expectation.

  • Name: UploadFileChangedError
  • Code: -14
  • Description: UPLOAD_FILE_CHANGED
  • Type: system
const err = new chromiumNetErrors.UploadFileChangedError();
// or
const Err = chromiumNetErrors.getErrorByCode(-14);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('UPLOAD_FILE_CHANGED');
const err = new Err();

SocketNotConnectedError

The socket is not connected.

  • Name: SocketNotConnectedError
  • Code: -15
  • Description: SOCKET_NOT_CONNECTED
  • Type: system
const err = new chromiumNetErrors.SocketNotConnectedError();
// or
const Err = chromiumNetErrors.getErrorByCode(-15);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('SOCKET_NOT_CONNECTED');
const err = new Err();

FileExistsError

The file already exists.

  • Name: FileExistsError
  • Code: -16
  • Description: FILE_EXISTS
  • Type: system
const err = new chromiumNetErrors.FileExistsError();
// or
const Err = chromiumNetErrors.getErrorByCode(-16);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('FILE_EXISTS');
const err = new Err();

FilePathTooLongError

The path or file name is too long.

  • Name: FilePathTooLongError
  • Code: -17
  • Description: FILE_PATH_TOO_LONG
  • Type: system
const err = new chromiumNetErrors.FilePathTooLongError();
// or
const Err = chromiumNetErrors.getErrorByCode(-17);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('FILE_PATH_TOO_LONG');
const err = new Err();

FileNoSpaceError

Not enough room left on the disk.

  • Name: FileNoSpaceError
  • Code: -18
  • Description: FILE_NO_SPACE
  • Type: system
const err = new chromiumNetErrors.FileNoSpaceError();
// or
const Err = chromiumNetErrors.getErrorByCode(-18);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('FILE_NO_SPACE');
const err = new Err();

FileVirusInfectedError

The file has a virus.

  • Name: FileVirusInfectedError
  • Code: -19
  • Description: FILE_VIRUS_INFECTED
  • Type: system
const err = new chromiumNetErrors.FileVirusInfectedError();
// or
const Err = chromiumNetErrors.getErrorByCode(-19);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('FILE_VIRUS_INFECTED');
const err = new Err();

BlockedByClientError

The client chose to block the request.

  • Name: BlockedByClientError
  • Code: -20
  • Description: BLOCKED_BY_CLIENT
  • Type: system
const err = new chromiumNetErrors.BlockedByClientError();
// or
const Err = chromiumNetErrors.getErrorByCode(-20);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('BLOCKED_BY_CLIENT');
const err = new Err();

NetworkChangedError

The network changed.

  • Name: NetworkChangedError
  • Code: -21
  • Description: NETWORK_CHANGED
  • Type: system
const err = new chromiumNetErrors.NetworkChangedError();
// or
const Err = chromiumNetErrors.getErrorByCode(-21);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('NETWORK_CHANGED');
const err = new Err();

BlockedByAdministratorError

The request was blocked by the URL block list configured by the domain administrator.

  • Name: BlockedByAdministratorError
  • Code: -22
  • Description: BLOCKED_BY_ADMINISTRATOR
  • Type: system
const err = new chromiumNetErrors.BlockedByAdministratorError();
// or
const Err = chromiumNetErrors.getErrorByCode(-22);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('BLOCKED_BY_ADMINISTRATOR');
const err = new Err();

SocketIsConnectedError

The socket is already connected.

  • Name: SocketIsConnectedError
  • Code: -23
  • Description: SOCKET_IS_CONNECTED
  • Type: system
const err = new chromiumNetErrors.SocketIsConnectedError();
// or
const Err = chromiumNetErrors.getErrorByCode(-23);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('SOCKET_IS_CONNECTED');
const err = new Err();

BlockedEnrollmentCheckPendingError

The request was blocked because the forced reenrollment check is still pending. This error can only occur on ChromeOS. The error can be emitted by code in chrome/browser/policy/policy_helpers.cc.

  • Name: BlockedEnrollmentCheckPendingError
  • Code: -24
  • Description: BLOCKED_ENROLLMENT_CHECK_PENDING
  • Type: system
const err = new chromiumNetErrors.BlockedEnrollmentCheckPendingError();
// or
const Err = chromiumNetErrors.getErrorByCode(-24);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('BLOCKED_ENROLLMENT_CHECK_PENDING');
const err = new Err();

UploadStreamRewindNotSupportedError

The upload failed because the upload stream needed to be re-read, due to a retry or a redirect, but the upload stream doesn't support that operation.

  • Name: UploadStreamRewindNotSupportedError
  • Code: -25
  • Description: UPLOAD_STREAM_REWIND_NOT_SUPPORTED
  • Type: system
const err = new chromiumNetErrors.UploadStreamRewindNotSupportedError();
// or
const Err = chromiumNetErrors.getErrorByCode(-25);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('UPLOAD_STREAM_REWIND_NOT_SUPPORTED');
const err = new Err();

ContextShutDownError

The request failed because the URLRequestContext is shutting down, or has been shut down.

  • Name: ContextShutDownError
  • Code: -26
  • Description: CONTEXT_SHUT_DOWN
  • Type: system
const err = new chromiumNetErrors.ContextShutDownError();
// or
const Err = chromiumNetErrors.getErrorByCode(-26);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('CONTEXT_SHUT_DOWN');
const err = new Err();

BlockedByResponseError

The request failed because the response was delivered along with requirements which are not met ('X-Frame-Options' and 'Content-Security-Policy' ancestor checks and 'Cross-Origin-Resource-Policy', for instance).

  • Name: BlockedByResponseError
  • Code: -27
  • Description: BLOCKED_BY_RESPONSE
  • Type: system
const err = new chromiumNetErrors.BlockedByResponseError();
// or
const Err = chromiumNetErrors.getErrorByCode(-27);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('BLOCKED_BY_RESPONSE');
const err = new Err();

CleartextNotPermittedError

The request was blocked by system policy disallowing some or all cleartext requests. Used for NetworkSecurityPolicy on Android.

  • Name: CleartextNotPermittedError
  • Code: -29
  • Description: CLEARTEXT_NOT_PERMITTED
  • Type: system
const err = new chromiumNetErrors.CleartextNotPermittedError();
// or
const Err = chromiumNetErrors.getErrorByCode(-29);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('CLEARTEXT_NOT_PERMITTED');
const err = new Err();

BlockedByCspError

The request was blocked by a Content Security Policy

  • Name: BlockedByCspError
  • Code: -30
  • Description: BLOCKED_BY_CSP
  • Type: system
const err = new chromiumNetErrors.BlockedByCspError();
// or
const Err = chromiumNetErrors.getErrorByCode(-30);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('BLOCKED_BY_CSP');
const err = new Err();

H2OrQuicRequiredError

The request was blocked because of no H/2 or QUIC session.

  • Name: H2OrQuicRequiredError
  • Code: -31
  • Description: H2_OR_QUIC_REQUIRED
  • Type: system
const err = new chromiumNetErrors.H2OrQuicRequiredError();
// or
const Err = chromiumNetErrors.getErrorByCode(-31);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('H2_OR_QUIC_REQUIRED');
const err = new Err();

ConnectionClosedError

A connection was closed (corresponding to a TCP FIN).

  • Name: ConnectionClosedError
  • Code: -100
  • Description: CONNECTION_CLOSED
  • Type: connection
const err = new chromiumNetErrors.ConnectionClosedError();
// or
const Err = chromiumNetErrors.getErrorByCode(-100);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('CONNECTION_CLOSED');
const err = new Err();

ConnectionResetError

A connection was reset (corresponding to a TCP RST).

  • Name: ConnectionResetError
  • Code: -101
  • Description: CONNECTION_RESET
  • Type: connection
const err = new chromiumNetErrors.ConnectionResetError();
// or
const Err = chromiumNetErrors.getErrorByCode(-101);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('CONNECTION_RESET');
const err = new Err();

ConnectionRefusedError

A connection attempt was refused.

  • Name: ConnectionRefusedError
  • Code: -102
  • Description: CONNECTION_REFUSED
  • Type: connection
const err = new chromiumNetErrors.ConnectionRefusedError();
// or
const Err = chromiumNetErrors.getErrorByCode(-102);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('CONNECTION_REFUSED');
const err = new Err();

ConnectionAbortedError

A connection timed out as a result of not receiving an ACK for data sent. This can include a FIN packet that did not get ACK'd.

  • Name: ConnectionAbortedError
  • Code: -103
  • Description: CONNECTION_ABORTED
  • Type: connection
const err = new chromiumNetErrors.ConnectionAbortedError();
// or
const Err = chromiumNetErrors.getErrorByCode(-103);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('CONNECTION_ABORTED');
const err = new Err();

ConnectionFailedError

A connection attempt failed.

  • Name: ConnectionFailedError
  • Code: -104
  • Description: CONNECTION_FAILED
  • Type: connection
const err = new chromiumNetErrors.ConnectionFailedError();
// or
const Err = chromiumNetErrors.getErrorByCode(-104);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('CONNECTION_FAILED');
const err = new Err();

NameNotResolvedError

The host name could not be resolved.

  • Name: NameNotResolvedError
  • Code: -105
  • Description: NAME_NOT_RESOLVED
  • Type: connection
const err = new chromiumNetErrors.NameNotResolvedError();
// or
const Err = chromiumNetErrors.getErrorByCode(-105);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('NAME_NOT_RESOLVED');
const err = new Err();

InternetDisconnectedError

The Internet connection has been lost.

  • Name: InternetDisconnectedError
  • Code: -106
  • Description: INTERNET_DISCONNECTED
  • Type: connection
const err = new chromiumNetErrors.InternetDisconnectedError();
// or
const Err = chromiumNetErrors.getErrorByCode(-106);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('INTERNET_DISCONNECTED');
const err = new Err();

SslProtocolError

An SSL protocol error occurred.

  • Name: SslProtocolError
  • Code: -107
  • Description: SSL_PROTOCOL_ERROR
  • Type: connection
const err = new chromiumNetErrors.SslProtocolError();
// or
const Err = chromiumNetErrors.getErrorByCode(-107);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('SSL_PROTOCOL_ERROR');
const err = new Err();

AddressInvalidError

The IP address or port number is invalid (e.g., cannot connect to the IP address 0 or the port 0).

  • Name: AddressInvalidError
  • Code: -108
  • Description: ADDRESS_INVALID
  • Type: connection
const err = new chromiumNetErrors.AddressInvalidError();
// or
const Err = chromiumNetErrors.getErrorByCode(-108);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('ADDRESS_INVALID');
const err = new Err();

AddressUnreachableError

The IP address is unreachable. This usually means that there is no route to the specified host or network.

  • Name: AddressUnreachableError
  • Code: -109
  • Description: ADDRESS_UNREACHABLE
  • Type: connection
const err = new chromiumNetErrors.AddressUnreachableError();
// or
const Err = chromiumNetErrors.getErrorByCode(-109);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('ADDRESS_UNREACHABLE');
const err = new Err();

SslClientAuthCertNeededError

The server requested a client certificate for SSL client authentication.

  • Name: SslClientAuthCertNeededError
  • Code: -110
  • Description: SSL_CLIENT_AUTH_CERT_NEEDED
  • Type: connection
const err = new chromiumNetErrors.SslClientAuthCertNeededError();
// or
const Err = chromiumNetErrors.getErrorByCode(-110);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('SSL_CLIENT_AUTH_CERT_NEEDED');
const err = new Err();

TunnelConnectionFailedError

A tunnel connection through the proxy could not be established.

  • Name: TunnelConnectionFailedError
  • Code: -111
  • Description: TUNNEL_CONNECTION_FAILED
  • Type: connection
const err = new chromiumNetErrors.TunnelConnectionFailedError();
// or
const Err = chromiumNetErrors.getErrorByCode(-111);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('TUNNEL_CONNECTION_FAILED');
const err = new Err();

NoSslVersionsEnabledError

No SSL protocol versions are enabled.

  • Name: NoSslVersionsEnabledError
  • Code: -112
  • Description: NO_SSL_VERSIONS_ENABLED
  • Type: connection
const err = new chromiumNetErrors.NoSslVersionsEnabledError();
// or
const Err = chromiumNetErrors.getErrorByCode(-112);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('NO_SSL_VERSIONS_ENABLED');
const err = new Err();

SslVersionOrCipherMismatchError

The client and server don't support a common SSL protocol version or cipher suite.

  • Name: SslVersionOrCipherMismatchError
  • Code: -113
  • Description: SSL_VERSION_OR_CIPHER_MISMATCH
  • Type: connection
const err = new chromiumNetErrors.SslVersionOrCipherMismatchError();
// or
const Err = chromiumNetErrors.getErrorByCode(-113);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('SSL_VERSION_OR_CIPHER_MISMATCH');
const err = new Err();

SslRenegotiationRequestedError

The server requested a renegotiation (rehandshake).

  • Name: SslRenegotiationRequestedError
  • Code: -114
  • Description: SSL_RENEGOTIATION_REQUESTED
  • Type: connection
const err = new chromiumNetErrors.SslRenegotiationRequestedError();
// or
const Err = chromiumNetErrors.getErrorByCode(-114);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('SSL_RENEGOTIATION_REQUESTED');
const err = new Err();

ProxyAuthUnsupportedError

The proxy requested authentication (for tunnel establishment) with an unsupported method.

  • Name: ProxyAuthUnsupportedError
  • Code: -115
  • Description: PROXY_AUTH_UNSUPPORTED
  • Type: connection
const err = new chromiumNetErrors.ProxyAuthUnsupportedError();
// or
const Err = chromiumNetErrors.getErrorByCode(-115);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('PROXY_AUTH_UNSUPPORTED');
const err = new Err();

CertErrorInSslRenegotiationError

During SSL renegotiation (rehandshake), the server sent a certificate with an error.

Note: this error is not in the -2xx range so that it won't be handled as a certificate error.

  • Name: CertErrorInSslRenegotiationError
  • Code: -116
  • Description: CERT_ERROR_IN_SSL_RENEGOTIATION
  • Type: connection
const err = new chromiumNetErrors.CertErrorInSslRenegotiationError();
// or
const Err = chromiumNetErrors.getErrorByCode(-116);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('CERT_ERROR_IN_SSL_RENEGOTIATION');
const err = new Err();

BadSslClientAuthCertError

The SSL handshake failed because of a bad or missing client certificate.

  • Name: BadSslClientAuthCertError
  • Code: -117
  • Description: BAD_SSL_CLIENT_AUTH_CERT
  • Type: connection
const err = new chromiumNetErrors.BadSslClientAuthCertError();
// or
const Err = chromiumNetErrors.getErrorByCode(-117);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('BAD_SSL_CLIENT_AUTH_CERT');
const err = new Err();

ConnectionTimedOutError

A connection attempt timed out.

  • Name: ConnectionTimedOutError
  • Code: -118
  • Description: CONNECTION_TIMED_OUT
  • Type: connection
const err = new chromiumNetErrors.ConnectionTimedOutError();
// or
const Err = chromiumNetErrors.getErrorByCode(-118);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('CONNECTION_TIMED_OUT');
const err = new Err();

HostResolverQueueTooLargeError

There are too many pending DNS resolves, so a request in the queue was aborted.

  • Name: HostResolverQueueTooLargeError
  • Code: -119
  • Description: HOST_RESOLVER_QUEUE_TOO_LARGE
  • Type: connection
const err = new chromiumNetErrors.HostResolverQueueTooLargeError();
// or
const Err = chromiumNetErrors.getErrorByCode(-119);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('HOST_RESOLVER_QUEUE_TOO_LARGE');
const err = new Err();

SocksConnectionFailedError

Failed establishing a connection to the SOCKS proxy server for a target host.

  • Name: SocksConnectionFailedError
  • Code: -120
  • Description: SOCKS_CONNECTION_FAILED
  • Type: connection
const err = new chromiumNetErrors.SocksConnectionFailedError();
// or
const Err = chromiumNetErrors.getErrorByCode(-120);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('SOCKS_CONNECTION_FAILED');
const err = new Err();

SocksConnectionHostUnreachableError

The SOCKS proxy server failed establishing connection to the target host because that host is unreachable.

  • Name: SocksConnectionHostUnreachableError
  • Code: -121
  • Description: SOCKS_CONNECTION_HOST_UNREACHABLE
  • Type: connection
const err = new chromiumNetErrors.SocksConnectionHostUnreachableError();
// or
const Err = chromiumNetErrors.getErrorByCode(-121);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('SOCKS_CONNECTION_HOST_UNREACHABLE');
const err = new Err();

AlpnNegotiationFailedError

The request to negotiate an alternate protocol failed.

  • Name: AlpnNegotiationFailedError
  • Code: -122
  • Description: ALPN_NEGOTIATION_FAILED
  • Type: connection
const err = new chromiumNetErrors.AlpnNegotiationFailedError();
// or
const Err = chromiumNetErrors.getErrorByCode(-122);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('ALPN_NEGOTIATION_FAILED');
const err = new Err();

SslNoRenegotiationError

The peer sent an SSL no_renegotiation alert message.

  • Name: SslNoRenegotiationError
  • Code: -123
  • Description: SSL_NO_RENEGOTIATION
  • Type: connection
const err = new chromiumNetErrors.SslNoRenegotiationError();
// or
const Err = chromiumNetErrors.getErrorByCode(-123);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('SSL_NO_RENEGOTIATION');
const err = new Err();

WinsockUnexpectedWrittenBytesError

Winsock sometimes reports more data written than passed. This is probably due to a broken LSP.

  • Name: WinsockUnexpectedWrittenBytesError
  • Code: -124
  • Description: WINSOCK_UNEXPECTED_WRITTEN_BYTES
  • Type: connection
const err = new chromiumNetErrors.WinsockUnexpectedWrittenBytesError();
// or
const Err = chromiumNetErrors.getErrorByCode(-124);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('WINSOCK_UNEXPECTED_WRITTEN_BYTES');
const err = new Err();

SslDecompressionFailureAlertError

An SSL peer sent us a fatal decompression_failure alert. This typically occurs when a peer selects DEFLATE compression in the mistaken belief that it supports it.

  • Name: SslDecompressionFailureAlertError
  • Code: -125
  • Description: SSL_DECOMPRESSION_FAILURE_ALERT
  • Type: connection
const err = new chromiumNetErrors.SslDecompressionFailureAlertError();
// or
const Err = chromiumNetErrors.getErrorByCode(-125);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('SSL_DECOMPRESSION_FAILURE_ALERT');
const err = new Err();

SslBadRecordMacAlertError

An SSL peer sent us a fatal bad_record_mac alert. This has been observed from servers with buggy DEFLATE support.

  • Name: SslBadRecordMacAlertError
  • Code: -126
  • Description: SSL_BAD_RECORD_MAC_ALERT
  • Type: connection
const err = new chromiumNetErrors.SslBadRecordMacAlertError();
// or
const Err = chromiumNetErrors.getErrorByCode(-126);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('SSL_BAD_RECORD_MAC_ALERT');
const err = new Err();

ProxyAuthRequestedError

The proxy requested authentication (for tunnel establishment).

  • Name: ProxyAuthRequestedError
  • Code: -127
  • Description: PROXY_AUTH_REQUESTED
  • Type: connection
const err = new chromiumNetErrors.ProxyAuthRequestedError();
// or
const Err = chromiumNetErrors.getErrorByCode(-127);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('PROXY_AUTH_REQUESTED');
const err = new Err();

ProxyConnectionFailedError

Could not create a connection to the proxy server. An error occurred either in resolving its name, or in connecting a socket to it. Note that this does NOT include failures during the actual "CONNECT" method of an HTTP proxy.

  • Name: ProxyConnectionFailedError
  • Code: -130
  • Description: PROXY_CONNECTION_FAILED
  • Type: connection
const err = new chromiumNetErrors.ProxyConnectionFailedError();
// or
const Err = chromiumNetErrors.getErrorByCode(-130);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('PROXY_CONNECTION_FAILED');
const err = new Err();

MandatoryProxyConfigurationFailedError

A mandatory proxy configuration could not be used. Currently this means that a mandatory PAC script could not be fetched, parsed or executed.

  • Name: MandatoryProxyConfigurationFailedError
  • Code: -131
  • Description: MANDATORY_PROXY_CONFIGURATION_FAILED
  • Type: connection
const err = new chromiumNetErrors.MandatoryProxyConfigurationFailedError();
// or
const Err = chromiumNetErrors.getErrorByCode(-131);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('MANDATORY_PROXY_CONFIGURATION_FAILED');
const err = new Err();

PreconnectMaxSocketLimitError

We've hit the max socket limit for the socket pool while preconnecting. We don't bother trying to preconnect more sockets.

  • Name: PreconnectMaxSocketLimitError
  • Code: -133
  • Description: PRECONNECT_MAX_SOCKET_LIMIT
  • Type: connection
const err = new chromiumNetErrors.PreconnectMaxSocketLimitError();
// or
const Err = chromiumNetErrors.getErrorByCode(-133);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('PRECONNECT_MAX_SOCKET_LIMIT');
const err = new Err();

SslClientAuthPrivateKeyAccessDeniedError

The permission to use the SSL client certificate's private key was denied.

  • Name: SslClientAuthPrivateKeyAccessDeniedError
  • Code: -134
  • Description: SSL_CLIENT_AUTH_PRIVATE_KEY_ACCESS_DENIED
  • Type: connection
const err = new chromiumNetErrors.SslClientAuthPrivateKeyAccessDeniedError();
// or
const Err = chromiumNetErrors.getErrorByCode(-134);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('SSL_CLIENT_AUTH_PRIVATE_KEY_ACCESS_DENIED');
const err = new Err();

SslClientAuthCertNoPrivateKeyError

The SSL client certificate has no private key.

  • Name: SslClientAuthCertNoPrivateKeyError
  • Code: -135
  • Description: SSL_CLIENT_AUTH_CERT_NO_PRIVATE_KEY
  • Type: connection
const err = new chromiumNetErrors.SslClientAuthCertNoPrivateKeyError();
// or
const Err = chromiumNetErrors.getErrorByCode(-135);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('SSL_CLIENT_AUTH_CERT_NO_PRIVATE_KEY');
const err = new Err();

ProxyCertificateInvalidError

The certificate presented by the HTTPS Proxy was invalid.

  • Name: ProxyCertificateInvalidError
  • Code: -136
  • Description: PROXY_CERTIFICATE_INVALID
  • Type: connection
const err = new chromiumNetErrors.ProxyCertificateInvalidError();
// or
const Err = chromiumNetErrors.getErrorByCode(-136);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('PROXY_CERTIFICATE_INVALID');
const err = new Err();

NameResolutionFailedError

An error occurred when trying to do a name resolution (DNS).

  • Name: NameResolutionFailedError
  • Code: -137
  • Description: NAME_RESOLUTION_FAILED
  • Type: connection
const err = new chromiumNetErrors.NameResolutionFailedError();
// or
const Err = chromiumNetErrors.getErrorByCode(-137);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('NAME_RESOLUTION_FAILED');
const err = new Err();

NetworkAccessDeniedError

Permission to access the network was denied. This is used to distinguish errors that were most likely caused by a firewall from other access denied errors. See also ERR_ACCESS_DENIED.

  • Name: NetworkAccessDeniedError
  • Code: -138
  • Description: NETWORK_ACCESS_DENIED
  • Type: connection
const err = new chromiumNetErrors.NetworkAccessDeniedError();
// or
const Err = chromiumNetErrors.getErrorByCode(-138);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('NETWORK_ACCESS_DENIED');
const err = new Err();

TemporarilyThrottledError

The request throttler module cancelled this request to avoid DDOS.

  • Name: TemporarilyThrottledError
  • Code: -139
  • Description: TEMPORARILY_THROTTLED
  • Type: connection
const err = new chromiumNetErrors.TemporarilyThrottledError();
// or
const Err = chromiumNetErrors.getErrorByCode(-139);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('TEMPORARILY_THROTTLED');
const err = new Err();

HttpsProxyTunnelResponseRedirectError

A request to create an SSL tunnel connection through the HTTPS proxy received a 302 (temporary redirect) response. The response body might include a description of why the request failed.

TODO(https://crbug.com/928551): This is deprecated and should not be used by new code.

  • Name: HttpsProxyTunnelResponseRedirectError
  • Code: -140
  • Description: HTTPS_PROXY_TUNNEL_RESPONSE_REDIRECT
  • Type: connection
const err = new chromiumNetErrors.HttpsProxyTunnelResponseRedirectError();
// or
const Err = chromiumNetErrors.getErrorByCode(-140);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('HTTPS_PROXY_TUNNEL_RESPONSE_REDIRECT');
const err = new Err();

SslClientAuthSignatureFailedError

We were unable to sign the CertificateVerify data of an SSL client auth handshake with the client certificate's private key.

Possible causes for this include the user implicitly or explicitly denying access to the private key, the private key may not be valid for signing, the key may be relying on a cached handle which is no longer valid, or the CSP won't allow arbitrary data to be signed.

  • Name: SslClientAuthSignatureFailedError
  • Code: -141
  • Description: SSL_CLIENT_AUTH_SIGNATURE_FAILED
  • Type: connection
const err = new chromiumNetErrors.SslClientAuthSignatureFailedError();
// or
const Err = chromiumNetErrors.getErrorByCode(-141);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('SSL_CLIENT_AUTH_SIGNATURE_FAILED');
const err = new Err();

MsgTooBigError

The message was too large for the transport. (for example a UDP message which exceeds size threshold).

  • Name: MsgTooBigError
  • Code: -142
  • Description: MSG_TOO_BIG
  • Type: connection
const err = new chromiumNetErrors.MsgTooBigError();
// or
const Err = chromiumNetErrors.getErrorByCode(-142);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('MSG_TOO_BIG');
const err = new Err();

WsProtocolError

Websocket protocol error. Indicates that we are terminating the connection due to a malformed frame or other protocol violation.

  • Name: WsProtocolError
  • Code: -145
  • Description: WS_PROTOCOL_ERROR
  • Type: connection
const err = new chromiumNetErrors.WsProtocolError();
// or
const Err = chromiumNetErrors.getErrorByCode(-145);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('WS_PROTOCOL_ERROR');
const err = new Err();

AddressInUseError

Returned when attempting to bind an address that is already in use.

  • Name: AddressInUseError
  • Code: -147
  • Description: ADDRESS_IN_USE
  • Type: connection
const err = new chromiumNetErrors.AddressInUseError();
// or
const Err = chromiumNetErrors.getErrorByCode(-147);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('ADDRESS_IN_USE');
const err = new Err();

SslHandshakeNotCompletedError

An operation failed because the SSL handshake has not completed.

  • Name: SslHandshakeNotCompletedError
  • Code: -148
  • Description: SSL_HANDSHAKE_NOT_COMPLETED
  • Type: connection
const err = new chromiumNetErrors.SslHandshakeNotCompletedError();
// or
const Err = chromiumNetErrors.getErrorByCode(-148);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('SSL_HANDSHAKE_NOT_COMPLETED');
const err = new Err();

SslBadPeerPublicKeyError

SSL peer's public key is invalid.

  • Name: SslBadPeerPublicKeyError
  • Code: -149
  • Description: SSL_BAD_PEER_PUBLIC_KEY
  • Type: connection
const err = new chromiumNetErrors.SslBadPeerPublicKeyError();
// or
const Err = chromiumNetErrors.getErrorByCode(-149);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('SSL_BAD_PEER_PUBLIC_KEY');
const err = new Err();

SslPinnedKeyNotInCertChainError

The certificate didn't match the built-in public key pins for the host name. The pins are set in net/http/transport_security_state.cc and require that one of a set of public keys exist on the path from the leaf to the root.

  • Name: SslPinnedKeyNotInCertChainError
  • Code: -150
  • Description: SSL_PINNED_KEY_NOT_IN_CERT_CHAIN
  • Type: connection
const err = new chromiumNetErrors.SslPinnedKeyNotInCertChainError();
// or
const Err = chromiumNetErrors.getErrorByCode(-150);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('SSL_PINNED_KEY_NOT_IN_CERT_CHAIN');
const err = new Err();

ClientAuthCertTypeUnsupportedError

Server request for client certificate did not contain any types we support.

  • Name: ClientAuthCertTypeUnsupportedError
  • Code: -151
  • Description: CLIENT_AUTH_CERT_TYPE_UNSUPPORTED
  • Type: connection
const err = new chromiumNetErrors.ClientAuthCertTypeUnsupportedError();
// or
const Err = chromiumNetErrors.getErrorByCode(-151);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('CLIENT_AUTH_CERT_TYPE_UNSUPPORTED');
const err = new Err();

SslDecryptErrorAlertError

An SSL peer sent us a fatal decrypt_error alert. This typically occurs when a peer could not correctly verify a signature (in CertificateVerify or ServerKeyExchange) or validate a Finished message.

  • Name: SslDecryptErrorAlertError
  • Code: -153
  • Description: SSL_DECRYPT_ERROR_ALERT
  • Type: connection
const err = new chromiumNetErrors.SslDecryptErrorAlertError();
// or
const Err = chromiumNetErrors.getErrorByCode(-153);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('SSL_DECRYPT_ERROR_ALERT');
const err = new Err();

WsThrottleQueueTooLargeError

There are too many pending WebSocketJob instances, so the new job was not pushed to the queue.

  • Name: WsThrottleQueueTooLargeError
  • Code: -154
  • Description: WS_THROTTLE_QUEUE_TOO_LARGE
  • Type: connection
const err = new chromiumNetErrors.WsThrottleQueueTooLargeError();
// or
const Err = chromiumNetErrors.getErrorByCode(-154);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('WS_THROTTLE_QUEUE_TOO_LARGE');
const err = new Err();

SslServerCertChangedError

The SSL server certificate changed in a renegotiation.

  • Name: SslServerCertChangedError
  • Code: -156
  • Description: SSL_SERVER_CERT_CHANGED
  • Type: connection
const err = new chromiumNetErrors.SslServerCertChangedError();
// or
const Err = chromiumNetErrors.getErrorByCode(-156);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('SSL_SERVER_CERT_CHANGED');
const err = new Err();

SslUnrecognizedNameAlertError

The SSL server sent us a fatal unrecognized_name alert.

  • Name: SslUnrecognizedNameAlertError
  • Code: -159
  • Description: SSL_UNRECOGNIZED_NAME_ALERT
  • Type: connection
const err = new chromiumNetErrors.SslUnrecognizedNameAlertError();
// or
const Err = chromiumNetErrors.getErrorByCode(-159);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('SSL_UNRECOGNIZED_NAME_ALERT');
const err = new Err();

SocketSetReceiveBufferSizeError

Failed to set the socket's receive buffer size as requested.

  • Name: SocketSetReceiveBufferSizeError
  • Code: -160
  • Description: SOCKET_SET_RECEIVE_BUFFER_SIZE_ERROR
  • Type: connection
const err = new chromiumNetErrors.SocketSetReceiveBufferSizeError();
// or
const Err = chromiumNetErrors.getErrorByCode(-160);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('SOCKET_SET_RECEIVE_BUFFER_SIZE_ERROR');
const err = new Err();

SocketSetSendBufferSizeError

Failed to set the socket's send buffer size as requested.

  • Name: SocketSetSendBufferSizeError
  • Code: -161
  • Description: SOCKET_SET_SEND_BUFFER_SIZE_ERROR
  • Type: connection
const err = new chromiumNetErrors.SocketSetSendBufferSizeError();
// or
const Err = chromiumNetErrors.getErrorByCode(-161);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('SOCKET_SET_SEND_BUFFER_SIZE_ERROR');
const err = new Err();

SocketReceiveBufferSizeUnchangeableError

Failed to set the socket's receive buffer size as requested, despite success return code from setsockopt.

  • Name: SocketReceiveBufferSizeUnchangeableError
  • Code: -162
  • Description: SOCKET_RECEIVE_BUFFER_SIZE_UNCHANGEABLE
  • Type: connection
const err = new chromiumNetErrors.SocketReceiveBufferSizeUnchangeableError();
// or
const Err = chromiumNetErrors.getErrorByCode(-162);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('SOCKET_RECEIVE_BUFFER_SIZE_UNCHANGEABLE');
const err = new Err();

SocketSendBufferSizeUnchangeableError

Failed to set the socket's send buffer size as requested, despite success return code from setsockopt.

  • Name: SocketSendBufferSizeUnchangeableError
  • Code: -163
  • Description: SOCKET_SEND_BUFFER_SIZE_UNCHANGEABLE
  • Type: connection
const err = new chromiumNetErrors.SocketSendBufferSizeUnchangeableError();
// or
const Err = chromiumNetErrors.getErrorByCode(-163);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('SOCKET_SEND_BUFFER_SIZE_UNCHANGEABLE');
const err = new Err();

SslClientAuthCertBadFormatError

Failed to import a client certificate from the platform store into the SSL library.

  • Name: SslClientAuthCertBadFormatError
  • Code: -164
  • Description: SSL_CLIENT_AUTH_CERT_BAD_FORMAT
  • Type: connection
const err = new chromiumNetErrors.SslClientAuthCertBadFormatError();
// or
const Err = chromiumNetErrors.getErrorByCode(-164);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('SSL_CLIENT_AUTH_CERT_BAD_FORMAT');
const err = new Err();

IcannNameCollisionError

Resolving a hostname to an IP address list included the IPv4 address "127.0.53.53". This is a special IP address which ICANN has recommended to indicate there was a name collision, and alert admins to a potential problem.

  • Name: IcannNameCollisionError
  • Code: -166
  • Description: ICANN_NAME_COLLISION
  • Type: connection
const err = new chromiumNetErrors.IcannNameCollisionError();
// or
const Err = chromiumNetErrors.getErrorByCode(-166);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('ICANN_NAME_COLLISION');
const err = new Err();

SslServerCertBadFormatError

The SSL server presented a certificate which could not be decoded. This is not a certificate error code as no X509Certificate object is available. This error is fatal.

  • Name: SslServerCertBadFormatError
  • Code: -167
  • Description: SSL_SERVER_CERT_BAD_FORMAT
  • Type: connection
const err = new chromiumNetErrors.SslServerCertBadFormatError();
// or
const Err = chromiumNetErrors.getErrorByCode(-167);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('SSL_SERVER_CERT_BAD_FORMAT');
const err = new Err();

CtSthParsingFailedError

Certificate Transparency: Received a signed tree head that failed to parse.

  • Name: CtSthParsingFailedError
  • Code: -168
  • Description: CT_STH_PARSING_FAILED
  • Type: connection
const err = new chromiumNetErrors.CtSthParsingFailedError();
// or
const Err = chromiumNetErrors.getErrorByCode(-168);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('CT_STH_PARSING_FAILED');
const err = new Err();

CtSthIncompleteError

Certificate Transparency: Received a signed tree head whose JSON parsing was OK but was missing some of the fields.

  • Name: CtSthIncompleteError
  • Code: -169
  • Description: CT_STH_INCOMPLETE
  • Type: connection
const err = new chromiumNetErrors.CtSthIncompleteError();
// or
const Err = chromiumNetErrors.getErrorByCode(-169);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('CT_STH_INCOMPLETE');
const err = new Err();

UnableToReuseConnectionForProxyAuthError

The attempt to reuse a connection to send proxy auth credentials failed before the AuthController was used to generate credentials. The caller should reuse the controller with a new connection. This error is only used internally by the network stack.

  • Name: UnableToReuseConnectionForProxyAuthError
  • Code: -170
  • Description: UNABLE_TO_REUSE_CONNECTION_FOR_PROXY_AUTH
  • Type: connection
const err = new chromiumNetErrors.UnableToReuseConnectionForProxyAuthError();
// or
const Err = chromiumNetErrors.getErrorByCode(-170);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('UNABLE_TO_REUSE_CONNECTION_FOR_PROXY_AUTH');
const err = new Err();

CtConsistencyProofParsingFailedError

Certificate Transparency: Failed to parse the received consistency proof.

  • Name: CtConsistencyProofParsingFailedError
  • Code: -171
  • Description: CT_CONSISTENCY_PROOF_PARSING_FAILED
  • Type: connection
const err = new chromiumNetErrors.CtConsistencyProofParsingFailedError();
// or
const Err = chromiumNetErrors.getErrorByCode(-171);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('CT_CONSISTENCY_PROOF_PARSING_FAILED');
const err = new Err();

SslObsoleteCipherError

The SSL server required an unsupported cipher suite that has since been removed. This error will temporarily be signaled on a fallback for one or two releases immediately following a cipher suite's removal, after which the fallback will be removed.

  • Name: SslObsoleteCipherError
  • Code: -172
  • Description: SSL_OBSOLETE_CIPHER
  • Type: connection
const err = new chromiumNetErrors.SslObsoleteCipherError();
// or
const Err = chromiumNetErrors.getErrorByCode(-172);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('SSL_OBSOLETE_CIPHER');
const err = new Err();

WsUpgradeError

When a WebSocket handshake is done successfully and the connection has been upgraded, the URLRequest is cancelled with this error code.

  • Name: WsUpgradeError
  • Code: -173
  • Description: WS_UPGRADE
  • Type: connection
const err = new chromiumNetErrors.WsUpgradeError();
// or
const Err = chromiumNetErrors.getErrorByCode(-173);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('WS_UPGRADE');
const err = new Err();

ReadIfReadyNotImplementedError

Socket ReadIfReady support is not implemented. This error should not be user visible, because the normal Read() method is used as a fallback.

  • Name: ReadIfReadyNotImplementedError
  • Code: -174
  • Description: READ_IF_READY_NOT_IMPLEMENTED
  • Type: connection
const err = new chromiumNetErrors.ReadIfReadyNotImplementedError();
// or
const Err = chromiumNetErrors.getErrorByCode(-174);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('READ_IF_READY_NOT_IMPLEMENTED');
const err = new Err();

NoBufferSpaceError

No socket buffer space is available.

  • Name: NoBufferSpaceError
  • Code: -176
  • Description: NO_BUFFER_SPACE
  • Type: connection
const err = new chromiumNetErrors.NoBufferSpaceError();
// or
const Err = chromiumNetErrors.getErrorByCode(-176);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('NO_BUFFER_SPACE');
const err = new Err();

SslClientAuthNoCommonAlgorithmsError

There were no common signature algorithms between our client certificate private key and the server's preferences.

  • Name: SslClientAuthNoCommonAlgorithmsError
  • Code: -177
  • Description: SSL_CLIENT_AUTH_NO_COMMON_ALGORITHMS
  • Type: connection
const err = new chromiumNetErrors.SslClientAuthNoCommonAlgorithmsError();
// or
const Err = chromiumNetErrors.getErrorByCode(-177);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('SSL_CLIENT_AUTH_NO_COMMON_ALGORITHMS');
const err = new Err();

EarlyDataRejectedError

TLS 1.3 early data was rejected by the server. This will be received before any data is returned from the socket. The request should be retried with early data disabled.

  • Name: EarlyDataRejectedError
  • Code: -178
  • Description: EARLY_DATA_REJECTED
  • Type: connection
const err = new chromiumNetErrors.EarlyDataRejectedError();
// or
const Err = chromiumNetErrors.getErrorByCode(-178);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('EARLY_DATA_REJECTED');
const err = new Err();

WrongVersionOnEarlyDataError

TLS 1.3 early data was offered, but the server responded with TLS 1.2 or earlier. This is an internal error code to account for a backwards-compatibility issue with early data and TLS 1.2. It will be received before any data is returned from the socket. The request should be retried with early data disabled.

See https://tools.ietf.org/html/rfc8446#appendix-D.3 for details.

  • Name: WrongVersionOnEarlyDataError
  • Code: -179
  • Description: WRONG_VERSION_ON_EARLY_DATA
  • Type: connection
const err = new chromiumNetErrors.WrongVersionOnEarlyDataError();
// or
const Err = chromiumNetErrors.getErrorByCode(-179);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('WRONG_VERSION_ON_EARLY_DATA');
const err = new Err();

Tls13DowngradeDetectedError

TLS 1.3 was enabled, but a lower version was negotiated and the server returned a value indicating it supported TLS 1.3. This is part of a security check in TLS 1.3, but it may also indicate the user is behind a buggy TLS-terminating proxy which implemented TLS 1.2 incorrectly. (See https://crbug.com/boringssl/226.)

  • Name: Tls13DowngradeDetectedError
  • Code: -180
  • Description: TLS13_DOWNGRADE_DETECTED
  • Type: connection
const err = new chromiumNetErrors.Tls13DowngradeDetectedError();
// or
const Err = chromiumNetErrors.getErrorByCode(-180);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('TLS13_DOWNGRADE_DETECTED');
const err = new Err();

SslKeyUsageIncompatibleError

The server's certificate has a keyUsage extension incompatible with the negotiated TLS key exchange method.

  • Name: SslKeyUsageIncompatibleError
  • Code: -181
  • Description: SSL_KEY_USAGE_INCOMPATIBLE
  • Type: connection
const err = new chromiumNetErrors.SslKeyUsageIncompatibleError();
// or
const Err = chromiumNetErrors.getErrorByCode(-181);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('SSL_KEY_USAGE_INCOMPATIBLE');
const err = new Err();

CertCommonNameInvalidError

The server responded with a certificate whose common name did not match the host name. This could mean:

An attacker has redirected our traffic to their server and is presenting a certificate for which they know the private key.

The server is misconfigured and responding with the wrong cert.

The user is on a wireless network and is being redirected to the network's login page.

The OS has used a DNS search suffix and the server doesn't have a certificate for the abbreviated name in the address bar.

  • Name: CertCommonNameInvalidError
  • Code: -200
  • Description: CERT_COMMON_NAME_INVALID
  • Type: certificate
const err = new chromiumNetErrors.CertCommonNameInvalidError();
// or
const Err = chromiumNetErrors.getErrorByCode(-200);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('CERT_COMMON_NAME_INVALID');
const err = new Err();

CertDateInvalidError

The server responded with a certificate that, by our clock, appears to either not yet be valid or to have expired. This could mean:

An attacker is presenting an old certificate for which they have managed to obtain the private key.

The server is misconfigured and is not presenting a valid cert.

Our clock is wrong.

  • Name: CertDateInvalidError
  • Code: -201
  • Description: CERT_DATE_INVALID
  • Type: certificate
const err = new chromiumNetErrors.CertDateInvalidError();
// or
const Err = chromiumNetErrors.getErrorByCode(-201);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('CERT_DATE_INVALID');
const err = new Err();

CertAuthorityInvalidError

The server responded with a certificate that is signed by an authority we don't trust. The could mean:

An attacker has substituted the real certificate for a cert that contains their public key and is signed by their cousin.

The server operator has a legitimate certificate from a CA we don't know about, but should trust.

The server is presenting a self-signed certificate, providing no defense against active attackers (but foiling passive attackers).

  • Name: CertAuthorityInvalidError
  • Code: -202
  • Description: CERT_AUTHORITY_INVALID
  • Type: certificate
const err = new chromiumNetErrors.CertAuthorityInvalidError();
// or
const Err = chromiumNetErrors.getErrorByCode(-202);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('CERT_AUTHORITY_INVALID');
const err = new Err();

CertContainsErrorsError

The server responded with a certificate that contains errors. This error is not recoverable.

MSDN describes this error as follows: "The SSL certificate contains errors." NOTE: It's unclear how this differs from ERR_CERT_INVALID. For consistency, use that code instead of this one from now on.

  • Name: CertContainsErrorsError
  • Code: -203
  • Description: CERT_CONTAINS_ERRORS
  • Type: certificate
const err = new chromiumNetErrors.CertContainsErrorsError();
// or
const Err = chromiumNetErrors.getErrorByCode(-203);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('CERT_CONTAINS_ERRORS');
const err = new Err();

CertNoRevocationMechanismError

The certificate has no mechanism for determining if it is revoked. In effect, this certificate cannot be revoked.

  • Name: CertNoRevocationMechanismError
  • Code: -204
  • Description: CERT_NO_REVOCATION_MECHANISM
  • Type: certificate
const err = new chromiumNetErrors.CertNoRevocationMechanismError();
// or
const Err = chromiumNetErrors.getErrorByCode(-204);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('CERT_NO_REVOCATION_MECHANISM');
const err = new Err();

CertUnableToCheckRevocationError

Revocation information for the security certificate for this site is not available. This could mean:

An attacker has compromised the private key in the certificate and is blocking our attempt to find out that the cert was revoked.

The certificate is unrevoked, but the revocation server is busy or unavailable.

  • Name: CertUnableToCheckRevocationError
  • Code: -205
  • Description: CERT_UNABLE_TO_CHECK_REVOCATION
  • Type: certificate
const err = new chromiumNetErrors.CertUnableToCheckRevocationError();
// or
const Err = chromiumNetErrors.getErrorByCode(-205);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('CERT_UNABLE_TO_CHECK_REVOCATION');
const err = new Err();

CertRevokedError

The server responded with a certificate has been revoked. We have the capability to ignore this error, but it is probably not the thing to do.

  • Name: CertRevokedError
  • Code: -206
  • Description: CERT_REVOKED
  • Type: certificate
const err = new chromiumNetErrors.CertRevokedError();
// or
const Err = chromiumNetErrors.getErrorByCode(-206);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('CERT_REVOKED');
const err = new Err();

CertInvalidError

The server responded with a certificate that is invalid. This error is not recoverable.

MSDN describes this error as follows: "The SSL certificate is invalid."

  • Name: CertInvalidError
  • Code: -207
  • Description: CERT_INVALID
  • Type: certificate
const err = new chromiumNetErrors.CertInvalidError();
// or
const Err = chromiumNetErrors.getErrorByCode(-207);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('CERT_INVALID');
const err = new Err();

CertWeakSignatureAlgorithmError

The server responded with a certificate that is signed using a weak signature algorithm.

  • Name: CertWeakSignatureAlgorithmError
  • Code: -208
  • Description: CERT_WEAK_SIGNATURE_ALGORITHM
  • Type: certificate
const err = new chromiumNetErrors.CertWeakSignatureAlgorithmError();
// or
const Err = chromiumNetErrors.getErrorByCode(-208);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('CERT_WEAK_SIGNATURE_ALGORITHM');
const err = new Err();

CertNonUniqueNameError

The host name specified in the certificate is not unique.

  • Name: CertNonUniqueNameError
  • Code: -210
  • Description: CERT_NON_UNIQUE_NAME
  • Type: certificate
const err = new chromiumNetErrors.CertNonUniqueNameError();
// or
const Err = chromiumNetErrors.getErrorByCode(-210);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('CERT_NON_UNIQUE_NAME');
const err = new Err();

CertWeakKeyError

The server responded with a certificate that contains a weak key (e.g. a too-small RSA key).

  • Name: CertWeakKeyError
  • Code: -211
  • Description: CERT_WEAK_KEY
  • Type: certificate
const err = new chromiumNetErrors.CertWeakKeyError();
// or
const Err = chromiumNetErrors.getErrorByCode(-211);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('CERT_WEAK_KEY');
const err = new Err();

CertNameConstraintViolationError

The certificate claimed DNS names that are in violation of name constraints.

  • Name: CertNameConstraintViolationError
  • Code: -212
  • Description: CERT_NAME_CONSTRAINT_VIOLATION
  • Type: certificate
const err = new chromiumNetErrors.CertNameConstraintViolationError();
// or
const Err = chromiumNetErrors.getErrorByCode(-212);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('CERT_NAME_CONSTRAINT_VIOLATION');
const err = new Err();

CertValidityTooLongError

The certificate's validity period is too long.

  • Name: CertValidityTooLongError
  • Code: -213
  • Description: CERT_VALIDITY_TOO_LONG
  • Type: certificate
const err = new chromiumNetErrors.CertValidityTooLongError();
// or
const Err = chromiumNetErrors.getErrorByCode(-213);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('CERT_VALIDITY_TOO_LONG');
const err = new Err();

CertificateTransparencyRequiredError

Certificate Transparency was required for this connection, but the server did not provide CT information that complied with the policy.

  • Name: CertificateTransparencyRequiredError
  • Code: -214
  • Description: CERTIFICATE_TRANSPARENCY_REQUIRED
  • Type: certificate
const err = new chromiumNetErrors.CertificateTransparencyRequiredError();
// or
const Err = chromiumNetErrors.getErrorByCode(-214);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('CERTIFICATE_TRANSPARENCY_REQUIRED');
const err = new Err();

CertSymantecLegacyError

The certificate chained to a legacy Symantec root that is no longer trusted. https://g.co/chrome/symantecpkicerts

  • Name: CertSymantecLegacyError
  • Code: -215
  • Description: CERT_SYMANTEC_LEGACY
  • Type: certificate
const err = new chromiumNetErrors.CertSymantecLegacyError();
// or
const Err = chromiumNetErrors.getErrorByCode(-215);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('CERT_SYMANTEC_LEGACY');
const err = new Err();

CertKnownInterceptionBlockedError

The certificate is known to be used for interception by an entity other the device owner.

  • Name: CertKnownInterceptionBlockedError
  • Code: -217
  • Description: CERT_KNOWN_INTERCEPTION_BLOCKED
  • Type: certificate
const err = new chromiumNetErrors.CertKnownInterceptionBlockedError();
// or
const Err = chromiumNetErrors.getErrorByCode(-217);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('CERT_KNOWN_INTERCEPTION_BLOCKED');
const err = new Err();

SslObsoleteVersionError

The connection uses an obsolete version of SSL/TLS.

  • Name: SslObsoleteVersionError
  • Code: -218
  • Description: SSL_OBSOLETE_VERSION
  • Type: certificate
const err = new chromiumNetErrors.SslObsoleteVersionError();
// or
const Err = chromiumNetErrors.getErrorByCode(-218);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('SSL_OBSOLETE_VERSION');
const err = new Err();

CertEndError

The value immediately past the last certificate error code.

  • Name: CertEndError
  • Code: -219
  • Description: CERT_END
  • Type: certificate
const err = new chromiumNetErrors.CertEndError();
// or
const Err = chromiumNetErrors.getErrorByCode(-219);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('CERT_END');
const err = new Err();

InvalidUrlError

The URL is invalid.

  • Name: InvalidUrlError
  • Code: -300
  • Description: INVALID_URL
  • Type: http
const err = new chromiumNetErrors.InvalidUrlError();
// or
const Err = chromiumNetErrors.getErrorByCode(-300);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('INVALID_URL');
const err = new Err();

DisallowedUrlSchemeError

The scheme of the URL is disallowed.

  • Name: DisallowedUrlSchemeError
  • Code: -301
  • Description: DISALLOWED_URL_SCHEME
  • Type: http
const err = new chromiumNetErrors.DisallowedUrlSchemeError();
// or
const Err = chromiumNetErrors.getErrorByCode(-301);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('DISALLOWED_URL_SCHEME');
const err = new Err();

UnknownUrlSchemeError

The scheme of the URL is unknown.

  • Name: UnknownUrlSchemeError
  • Code: -302
  • Description: UNKNOWN_URL_SCHEME
  • Type: http
const err = new chromiumNetErrors.UnknownUrlSchemeError();
// or
const Err = chromiumNetErrors.getErrorByCode(-302);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('UNKNOWN_URL_SCHEME');
const err = new Err();

InvalidRedirectError

Attempting to load an URL resulted in a redirect to an invalid URL.

  • Name: InvalidRedirectError
  • Code: -303
  • Description: INVALID_REDIRECT
  • Type: http
const err = new chromiumNetErrors.InvalidRedirectError();
// or
const Err = chromiumNetErrors.getErrorByCode(-303);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('INVALID_REDIRECT');
const err = new Err();

TooManyRedirectsError

Attempting to load an URL resulted in too many redirects.

  • Name: TooManyRedirectsError
  • Code: -310
  • Description: TOO_MANY_REDIRECTS
  • Type: http
const err = new chromiumNetErrors.TooManyRedirectsError();
// or
const Err = chromiumNetErrors.getErrorByCode(-310);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('TOO_MANY_REDIRECTS');
const err = new Err();

UnsafeRedirectError

Attempting to load an URL resulted in an unsafe redirect (e.g., a redirect to file:// is considered unsafe).

  • Name: UnsafeRedirectError
  • Code: -311
  • Description: UNSAFE_REDIRECT
  • Type: http
const err = new chromiumNetErrors.UnsafeRedirectError();
// or
const Err = chromiumNetErrors.getErrorByCode(-311);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('UNSAFE_REDIRECT');
const err = new Err();

UnsafePortError

Attempting to load an URL with an unsafe port number. These are port numbers that correspond to services, which are not robust to spurious input that may be constructed as a result of an allowed web construct (e.g., HTTP looks a lot like SMTP, so form submission to port 25 is denied).

  • Name: UnsafePortError
  • Code: -312
  • Description: UNSAFE_PORT
  • Type: http
const err = new chromiumNetErrors.UnsafePortError();
// or
const Err = chromiumNetErrors.getErrorByCode(-312);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('UNSAFE_PORT');
const err = new Err();

InvalidResponseError

The server's response was invalid.

  • Name: InvalidResponseError
  • Code: -320
  • Description: INVALID_RESPONSE
  • Type: http
const err = new chromiumNetErrors.InvalidResponseError();
// or
const Err = chromiumNetErrors.getErrorByCode(-320);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('INVALID_RESPONSE');
const err = new Err();

InvalidChunkedEncodingError

Error in chunked transfer encoding.

  • Name: InvalidChunkedEncodingError
  • Code: -321
  • Description: INVALID_CHUNKED_ENCODING
  • Type: http
const err = new chromiumNetErrors.InvalidChunkedEncodingError();
// or
const Err = chromiumNetErrors.getErrorByCode(-321);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('INVALID_CHUNKED_ENCODING');
const err = new Err();

MethodNotSupportedError

The server did not support the request method.

  • Name: MethodNotSupportedError
  • Code: -322
  • Description: METHOD_NOT_SUPPORTED
  • Type: http
const err = new chromiumNetErrors.MethodNotSupportedError();
// or
const Err = chromiumNetErrors.getErrorByCode(-322);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('METHOD_NOT_SUPPORTED');
const err = new Err();

UnexpectedProxyAuthError

The response was 407 (Proxy Authentication Required), yet we did not send the request to a proxy.

  • Name: UnexpectedProxyAuthError
  • Code: -323
  • Description: UNEXPECTED_PROXY_AUTH
  • Type: http
const err = new chromiumNetErrors.UnexpectedProxyAuthError();
// or
const Err = chromiumNetErrors.getErrorByCode(-323);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('UNEXPECTED_PROXY_AUTH');
const err = new Err();

EmptyResponseError

The server closed the connection without sending any data.

  • Name: EmptyResponseError
  • Code: -324
  • Description: EMPTY_RESPONSE
  • Type: http
const err = new chromiumNetErrors.EmptyResponseError();
// or
const Err = chromiumNetErrors.getErrorByCode(-324);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('EMPTY_RESPONSE');
const err = new Err();

ResponseHeadersTooBigError

The headers section of the response is too large.

  • Name: ResponseHeadersTooBigError
  • Code: -325
  • Description: RESPONSE_HEADERS_TOO_BIG
  • Type: http
const err = new chromiumNetErrors.ResponseHeadersTooBigError();
// or
const Err = chromiumNetErrors.getErrorByCode(-325);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('RESPONSE_HEADERS_TOO_BIG');
const err = new Err();

PacScriptFailedError

The evaluation of the PAC script failed.

  • Name: PacScriptFailedError
  • Code: -327
  • Description: PAC_SCRIPT_FAILED
  • Type: http
const err = new chromiumNetErrors.PacScriptFailedError();
// or
const Err = chromiumNetErrors.getErrorByCode(-327);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('PAC_SCRIPT_FAILED');
const err = new Err();

RequestRangeNotSatisfiableError

The response was 416 (Requested range not satisfiable) and the server cannot satisfy the range requested.

  • Name: RequestRangeNotSatisfiableError
  • Code: -328
  • Description: REQUEST_RANGE_NOT_SATISFIABLE
  • Type: http
const err = new chromiumNetErrors.RequestRangeNotSatisfiableError();
// or
const Err = chromiumNetErrors.getErrorByCode(-328);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('REQUEST_RANGE_NOT_SATISFIABLE');
const err = new Err();

MalformedIdentityError

The identity used for authentication is invalid.

  • Name: MalformedIdentityError
  • Code: -329
  • Description: MALFORMED_IDENTITY
  • Type: http
const err = new chromiumNetErrors.MalformedIdentityError();
// or
const Err = chromiumNetErrors.getErrorByCode(-329);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('MALFORMED_IDENTITY');
const err = new Err();

ContentDecodingFailedError

Content decoding of the response body failed.

  • Name: ContentDecodingFailedError
  • Code: -330
  • Description: CONTENT_DECODING_FAILED
  • Type: http
const err = new chromiumNetErrors.ContentDecodingFailedError();
// or
const Err = chromiumNetErrors.getErrorByCode(-330);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('CONTENT_DECODING_FAILED');
const err = new Err();

NetworkIoSuspendedError

An operation could not be completed because all network IO is suspended.

  • Name: NetworkIoSuspendedError
  • Code: -331
  • Description: NETWORK_IO_SUSPENDED
  • Type: http
const err = new chromiumNetErrors.NetworkIoSuspendedError();
// or
const Err = chromiumNetErrors.getErrorByCode(-331);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('NETWORK_IO_SUSPENDED');
const err = new Err();

SynReplyNotReceivedError

FLIP data received without receiving a SYN_REPLY on the stream.

  • Name: SynReplyNotReceivedError
  • Code: -332
  • Description: SYN_REPLY_NOT_RECEIVED
  • Type: http
const err = new chromiumNetErrors.SynReplyNotReceivedError();
// or
const Err = chromiumNetErrors.getErrorByCode(-332);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('SYN_REPLY_NOT_RECEIVED');
const err = new Err();

EncodingConversionFailedError

Converting the response to target encoding failed.

  • Name: EncodingConversionFailedError
  • Code: -333
  • Description: ENCODING_CONVERSION_FAILED
  • Type: http
const err = new chromiumNetErrors.EncodingConversionFailedError();
// or
const Err = chromiumNetErrors.getErrorByCode(-333);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('ENCODING_CONVERSION_FAILED');
const err = new Err();

UnrecognizedFtpDirectoryListingFormatError

The server sent an FTP directory listing in a format we do not understand.

  • Name: UnrecognizedFtpDirectoryListingFormatError
  • Code: -334
  • Description: UNRECOGNIZED_FTP_DIRECTORY_LISTING_FORMAT
  • Type: http
const err = new chromiumNetErrors.UnrecognizedFtpDirectoryListingFormatError();
// or
const Err = chromiumNetErrors.getErrorByCode(-334);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('UNRECOGNIZED_FTP_DIRECTORY_LISTING_FORMAT');
const err = new Err();

NoSupportedProxiesError

There are no supported proxies in the provided list.

  • Name: NoSupportedProxiesError
  • Code: -336
  • Description: NO_SUPPORTED_PROXIES
  • Type: http
const err = new chromiumNetErrors.NoSupportedProxiesError();
// or
const Err = chromiumNetErrors.getErrorByCode(-336);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('NO_SUPPORTED_PROXIES');
const err = new Err();

Http2ProtocolError

There is an HTTP/2 protocol error.

  • Name: Http2ProtocolError
  • Code: -337
  • Description: HTTP2_PROTOCOL_ERROR
  • Type: http
const err = new chromiumNetErrors.Http2ProtocolError();
// or
const Err = chromiumNetErrors.getErrorByCode(-337);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('HTTP2_PROTOCOL_ERROR');
const err = new Err();

InvalidAuthCredentialsError

Credentials could not be established during HTTP Authentication.

  • Name: InvalidAuthCredentialsError
  • Code: -338
  • Description: INVALID_AUTH_CREDENTIALS
  • Type: http
const err = new chromiumNetErrors.InvalidAuthCredentialsError();
// or
const Err = chromiumNetErrors.getErrorByCode(-338);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('INVALID_AUTH_CREDENTIALS');
const err = new Err();

UnsupportedAuthSchemeError

An HTTP Authentication scheme was tried which is not supported on this machine.

  • Name: UnsupportedAuthSchemeError
  • Code: -339
  • Description: UNSUPPORTED_AUTH_SCHEME
  • Type: http
const err = new chromiumNetErrors.UnsupportedAuthSchemeError();
// or
const Err = chromiumNetErrors.getErrorByCode(-339);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('UNSUPPORTED_AUTH_SCHEME');
const err = new Err();

EncodingDetectionFailedError

Detecting the encoding of the response failed.

  • Name: EncodingDetectionFailedError
  • Code: -340
  • Description: ENCODING_DETECTION_FAILED
  • Type: http
const err = new chromiumNetErrors.EncodingDetectionFailedError();
// or
const Err = chromiumNetErrors.getErrorByCode(-340);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('ENCODING_DETECTION_FAILED');
const err = new Err();

MissingAuthCredentialsError

(GSSAPI) No Kerberos credentials were available during HTTP Authentication.

  • Name: MissingAuthCredentialsError
  • Code: -341
  • Description: MISSING_AUTH_CREDENTIALS
  • Type: http
const err = new chromiumNetErrors.MissingAuthCredentialsError();
// or
const Err = chromiumNetErrors.getErrorByCode(-341);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('MISSING_AUTH_CREDENTIALS');
const err = new Err();

UnexpectedSecurityLibraryStatusError

An unexpected, but documented, SSPI or GSSAPI status code was returned.

  • Name: UnexpectedSecurityLibraryStatusError
  • Code: -342
  • Description: UNEXPECTED_SECURITY_LIBRARY_STATUS
  • Type: http
const err = new chromiumNetErrors.UnexpectedSecurityLibraryStatusError();
// or
const Err = chromiumNetErrors.getErrorByCode(-342);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('UNEXPECTED_SECURITY_LIBRARY_STATUS');
const err = new Err();

MisconfiguredAuthEnvironmentError

The environment was not set up correctly for authentication (for example, no KDC could be found or the principal is unknown.

  • Name: MisconfiguredAuthEnvironmentError
  • Code: -343
  • Description: MISCONFIGURED_AUTH_ENVIRONMENT
  • Type: http
const err = new chromiumNetErrors.MisconfiguredAuthEnvironmentError();
// or
const Err = chromiumNetErrors.getErrorByCode(-343);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('MISCONFIGURED_AUTH_ENVIRONMENT');
const err = new Err();

UndocumentedSecurityLibraryStatusError

An undocumented SSPI or GSSAPI status code was returned.

  • Name: UndocumentedSecurityLibraryStatusError
  • Code: -344
  • Description: UNDOCUMENTED_SECURITY_LIBRARY_STATUS
  • Type: http
const err = new chromiumNetErrors.UndocumentedSecurityLibraryStatusError();
// or
const Err = chromiumNetErrors.getErrorByCode(-344);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('UNDOCUMENTED_SECURITY_LIBRARY_STATUS');
const err = new Err();

ResponseBodyTooBigToDrainError

The HTTP response was too big to drain.

  • Name: ResponseBodyTooBigToDrainError
  • Code: -345
  • Description: RESPONSE_BODY_TOO_BIG_TO_DRAIN
  • Type: http
const err = new chromiumNetErrors.ResponseBodyTooBigToDrainError();
// or
const Err = chromiumNetErrors.getErrorByCode(-345);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('RESPONSE_BODY_TOO_BIG_TO_DRAIN');
const err = new Err();

ResponseHeadersMultipleContentLengthError

The HTTP response contained multiple distinct Content-Length headers.

  • Name: ResponseHeadersMultipleContentLengthError
  • Code: -346
  • Description: RESPONSE_HEADERS_MULTIPLE_CONTENT_LENGTH
  • Type: http
const err = new chromiumNetErrors.ResponseHeadersMultipleContentLengthError();
// or
const Err = chromiumNetErrors.getErrorByCode(-346);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('RESPONSE_HEADERS_MULTIPLE_CONTENT_LENGTH');
const err = new Err();

IncompleteHttp2HeadersError

HTTP/2 headers have been received, but not all of them - status or version headers are missing, so we're expecting additional frames to complete them.

  • Name: IncompleteHttp2HeadersError
  • Code: -347
  • Description: INCOMPLETE_HTTP2_HEADERS
  • Type: http
const err = new chromiumNetErrors.IncompleteHttp2HeadersError();
// or
const Err = chromiumNetErrors.getErrorByCode(-347);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('INCOMPLETE_HTTP2_HEADERS');
const err = new Err();

PacNotInDhcpError

No PAC URL configuration could be retrieved from DHCP. This can indicate either a failure to retrieve the DHCP configuration, or that there was no PAC URL configured in DHCP.

  • Name: PacNotInDhcpError
  • Code: -348
  • Description: PAC_NOT_IN_DHCP
  • Type: http
const err = new chromiumNetErrors.PacNotInDhcpError();
// or
const Err = chromiumNetErrors.getErrorByCode(-348);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('PAC_NOT_IN_DHCP');
const err = new Err();

ResponseHeadersMultipleContentDispositionError

The HTTP response contained multiple Content-Disposition headers.

  • Name: ResponseHeadersMultipleContentDispositionError
  • Code: -349
  • Description: RESPONSE_HEADERS_MULTIPLE_CONTENT_DISPOSITION
  • Type: http
const err = new chromiumNetErrors.ResponseHeadersMultipleContentDispositionError();
// or
const Err = chromiumNetErrors.getErrorByCode(-349);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('RESPONSE_HEADERS_MULTIPLE_CONTENT_DISPOSITION');
const err = new Err();

ResponseHeadersMultipleLocationError

The HTTP response contained multiple Location headers.

  • Name: ResponseHeadersMultipleLocationError
  • Code: -350
  • Description: RESPONSE_HEADERS_MULTIPLE_LOCATION
  • Type: http
const err = new chromiumNetErrors.ResponseHeadersMultipleLocationError();
// or
const Err = chromiumNetErrors.getErrorByCode(-350);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('RESPONSE_HEADERS_MULTIPLE_LOCATION');
const err = new Err();

Http2ServerRefusedStreamError

HTTP/2 server refused the request without processing, and sent either a GOAWAY frame with error code NO_ERROR and Last-Stream-ID lower than the stream id corresponding to the request indicating that this request has not been processed yet, or a RST_STREAM frame with error code REFUSED_STREAM. Client MAY retry (on a different connection). See RFC7540 Section 8.1.4.

  • Name: Http2ServerRefusedStreamError
  • Code: -351
  • Description: HTTP2_SERVER_REFUSED_STREAM
  • Type: http
const err = new chromiumNetErrors.Http2ServerRefusedStreamError();
// or
const Err = chromiumNetErrors.getErrorByCode(-351);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('HTTP2_SERVER_REFUSED_STREAM');
const err = new Err();

Http2PingFailedError

HTTP/2 server didn't respond to the PING message.

  • Name: Http2PingFailedError
  • Code: -352
  • Description: HTTP2_PING_FAILED
  • Type: http
const err = new chromiumNetErrors.Http2PingFailedError();
// or
const Err = chromiumNetErrors.getErrorByCode(-352);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('HTTP2_PING_FAILED');
const err = new Err();

ContentLengthMismatchError

The HTTP response body transferred fewer bytes than were advertised by the Content-Length header when the connection is closed.

  • Name: ContentLengthMismatchError
  • Code: -354
  • Description: CONTENT_LENGTH_MISMATCH
  • Type: http
const err = new chromiumNetErrors.ContentLengthMismatchError();
// or
const Err = chromiumNetErrors.getErrorByCode(-354);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('CONTENT_LENGTH_MISMATCH');
const err = new Err();

IncompleteChunkedEncodingError

The HTTP response body is transferred with Chunked-Encoding, but the terminating zero-length chunk was never sent when the connection is closed.

  • Name: IncompleteChunkedEncodingError
  • Code: -355
  • Description: INCOMPLETE_CHUNKED_ENCODING
  • Type: http
const err = new chromiumNetErrors.IncompleteChunkedEncodingError();
// or
const Err = chromiumNetErrors.getErrorByCode(-355);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('INCOMPLETE_CHUNKED_ENCODING');
const err = new Err();

QuicProtocolError

There is a QUIC protocol error.

  • Name: QuicProtocolError
  • Code: -356
  • Description: QUIC_PROTOCOL_ERROR
  • Type: http
const err = new chromiumNetErrors.QuicProtocolError();
// or
const Err = chromiumNetErrors.getErrorByCode(-356);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('QUIC_PROTOCOL_ERROR');
const err = new Err();

ResponseHeadersTruncatedError

The HTTP headers were truncated by an EOF.

  • Name: ResponseHeadersTruncatedError
  • Code: -357
  • Description: RESPONSE_HEADERS_TRUNCATED
  • Type: http
const err = new chromiumNetErrors.ResponseHeadersTruncatedError();
// or
const Err = chromiumNetErrors.getErrorByCode(-357);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('RESPONSE_HEADERS_TRUNCATED');
const err = new Err();

QuicHandshakeFailedError

The QUIC crytpo handshake failed. This means that the server was unable to read any requests sent, so they may be resent.

  • Name: QuicHandshakeFailedError
  • Code: -358
  • Description: QUIC_HANDSHAKE_FAILED
  • Type: http
const err = new chromiumNetErrors.QuicHandshakeFailedError();
// or
const Err = chromiumNetErrors.getErrorByCode(-358);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('QUIC_HANDSHAKE_FAILED');
const err = new Err();

Http2InadequateTransportSecurityError

Transport security is inadequate for the HTTP/2 version.

  • Name: Http2InadequateTransportSecurityError
  • Code: -360
  • Description: HTTP2_INADEQUATE_TRANSPORT_SECURITY
  • Type: http
const err = new chromiumNetErrors.Http2InadequateTransportSecurityError();
// or
const Err = chromiumNetErrors.getErrorByCode(-360);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('HTTP2_INADEQUATE_TRANSPORT_SECURITY');
const err = new Err();

Http2FlowControlError

The peer violated HTTP/2 flow control.

  • Name: Http2FlowControlError
  • Code: -361
  • Description: HTTP2_FLOW_CONTROL_ERROR
  • Type: http
const err = new chromiumNetErrors.Http2FlowControlError();
// or
const Err = chromiumNetErrors.getErrorByCode(-361);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('HTTP2_FLOW_CONTROL_ERROR');
const err = new Err();

Http2FrameSizeError

The peer sent an improperly sized HTTP/2 frame.

  • Name: Http2FrameSizeError
  • Code: -362
  • Description: HTTP2_FRAME_SIZE_ERROR
  • Type: http
const err = new chromiumNetErrors.Http2FrameSizeError();
// or
const Err = chromiumNetErrors.getErrorByCode(-362);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('HTTP2_FRAME_SIZE_ERROR');
const err = new Err();

Http2CompressionError

Decoding or encoding of compressed HTTP/2 headers failed.

  • Name: Http2CompressionError
  • Code: -363
  • Description: HTTP2_COMPRESSION_ERROR
  • Type: http
const err = new chromiumNetErrors.Http2CompressionError();
// or
const Err = chromiumNetErrors.getErrorByCode(-363);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('HTTP2_COMPRESSION_ERROR');
const err = new Err();

ProxyAuthRequestedWithNoConnectionError

Proxy Auth Requested without a valid Client Socket Handle.

  • Name: ProxyAuthRequestedWithNoConnectionError
  • Code: -364
  • Description: PROXY_AUTH_REQUESTED_WITH_NO_CONNECTION
  • Type: http
const err = new chromiumNetErrors.ProxyAuthRequestedWithNoConnectionError();
// or
const Err = chromiumNetErrors.getErrorByCode(-364);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('PROXY_AUTH_REQUESTED_WITH_NO_CONNECTION');
const err = new Err();

Http_1_1RequiredError

HTTP_1_1_REQUIRED error code received on HTTP/2 session.

  • Name: Http_1_1RequiredError
  • Code: -365
  • Description: HTTP_1_1_REQUIRED
  • Type: http
const err = new chromiumNetErrors.Http_1_1RequiredError();
// or
const Err = chromiumNetErrors.getErrorByCode(-365);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('HTTP_1_1_REQUIRED');
const err = new Err();

ProxyHttp_1_1RequiredError

HTTP_1_1_REQUIRED error code received on HTTP/2 session to proxy.

  • Name: ProxyHttp_1_1RequiredError
  • Code: -366
  • Description: PROXY_HTTP_1_1_REQUIRED
  • Type: http
const err = new chromiumNetErrors.ProxyHttp_1_1RequiredError();
// or
const Err = chromiumNetErrors.getErrorByCode(-366);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('PROXY_HTTP_1_1_REQUIRED');
const err = new Err();

PacScriptTerminatedError

The PAC script terminated fatally and must be reloaded.

  • Name: PacScriptTerminatedError
  • Code: -367
  • Description: PAC_SCRIPT_TERMINATED
  • Type: http
const err = new chromiumNetErrors.PacScriptTerminatedError();
// or
const Err = chromiumNetErrors.getErrorByCode(-367);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('PAC_SCRIPT_TERMINATED');
const err = new Err();

InvalidHttpResponseError

The server was expected to return an HTTP/1.x response, but did not. Rather than treat it as HTTP/0.9, this error is returned.

  • Name: InvalidHttpResponseError
  • Code: -370
  • Description: INVALID_HTTP_RESPONSE
  • Type: http
const err = new chromiumNetErrors.InvalidHttpResponseError();
// or
const Err = chromiumNetErrors.getErrorByCode(-370);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('INVALID_HTTP_RESPONSE');
const err = new Err();

ContentDecodingInitFailedError

Initializing content decoding failed.

  • Name: ContentDecodingInitFailedError
  • Code: -371
  • Description: CONTENT_DECODING_INIT_FAILED
  • Type: http
const err = new chromiumNetErrors.ContentDecodingInitFailedError();
// or
const Err = chromiumNetErrors.getErrorByCode(-371);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('CONTENT_DECODING_INIT_FAILED');
const err = new Err();

Http2RstStreamNoErrorReceivedError

Received HTTP/2 RST_STREAM frame with NO_ERROR error code. This error should be handled internally by HTTP/2 code, and should not make it above the SpdyStream layer.

  • Name: Http2RstStreamNoErrorReceivedError
  • Code: -372
  • Description: HTTP2_RST_STREAM_NO_ERROR_RECEIVED
  • Type: http
const err = new chromiumNetErrors.Http2RstStreamNoErrorReceivedError();
// or
const Err = chromiumNetErrors.getErrorByCode(-372);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('HTTP2_RST_STREAM_NO_ERROR_RECEIVED');
const err = new Err();

Http2PushedStreamNotAvailableError

The pushed stream claimed by the request is no longer available.

  • Name: Http2PushedStreamNotAvailableError
  • Code: -373
  • Description: HTTP2_PUSHED_STREAM_NOT_AVAILABLE
  • Type: http
const err = new chromiumNetErrors.Http2PushedStreamNotAvailableError();
// or
const Err = chromiumNetErrors.getErrorByCode(-373);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('HTTP2_PUSHED_STREAM_NOT_AVAILABLE');
const err = new Err();

Http2ClaimedPushedStreamResetByServerError

A pushed stream was claimed and later reset by the server. When this happens, the request should be retried.

  • Name: Http2ClaimedPushedStreamResetByServerError
  • Code: -374
  • Description: HTTP2_CLAIMED_PUSHED_STREAM_RESET_BY_SERVER
  • Type: http
const err = new chromiumNetErrors.Http2ClaimedPushedStreamResetByServerError();
// or
const Err = chromiumNetErrors.getErrorByCode(-374);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('HTTP2_CLAIMED_PUSHED_STREAM_RESET_BY_SERVER');
const err = new Err();

TooManyRetriesError

An HTTP transaction was retried too many times due for authentication or invalid certificates. This may be due to a bug in the net stack that would otherwise infinite loop, or if the server or proxy continually requests fresh credentials or presents a fresh invalid certificate.

  • Name: TooManyRetriesError
  • Code: -375
  • Description: TOO_MANY_RETRIES
  • Type: http
const err = new chromiumNetErrors.TooManyRetriesError();
// or
const Err = chromiumNetErrors.getErrorByCode(-375);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('TOO_MANY_RETRIES');
const err = new Err();

Http2StreamClosedError

Received an HTTP/2 frame on a closed stream.

  • Name: Http2StreamClosedError
  • Code: -376
  • Description: HTTP2_STREAM_CLOSED
  • Type: http
const err = new chromiumNetErrors.Http2StreamClosedError();
// or
const Err = chromiumNetErrors.getErrorByCode(-376);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('HTTP2_STREAM_CLOSED');
const err = new Err();

Http2ClientRefusedStreamError

Client is refusing an HTTP/2 stream.

  • Name: Http2ClientRefusedStreamError
  • Code: -377
  • Description: HTTP2_CLIENT_REFUSED_STREAM
  • Type: http
const err = new chromiumNetErrors.Http2ClientRefusedStreamError();
// or
const Err = chromiumNetErrors.getErrorByCode(-377);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('HTTP2_CLIENT_REFUSED_STREAM');
const err = new Err();

Http2PushedResponseDoesNotMatchError

A pushed HTTP/2 stream was claimed by a request based on matching URL and request headers, but the pushed response headers do not match the request.

  • Name: Http2PushedResponseDoesNotMatchError
  • Code: -378
  • Description: HTTP2_PUSHED_RESPONSE_DOES_NOT_MATCH
  • Type: http
const err = new chromiumNetErrors.Http2PushedResponseDoesNotMatchError();
// or
const Err = chromiumNetErrors.getErrorByCode(-378);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('HTTP2_PUSHED_RESPONSE_DOES_NOT_MATCH');
const err = new Err();

HttpResponseCodeFailureError

The server returned a non-2xx HTTP response code.

Not that this error is only used by certain APIs that interpret the HTTP response itself. URLRequest for instance just passes most non-2xx response back as success.

  • Name: HttpResponseCodeFailureError
  • Code: -379
  • Description: HTTP_RESPONSE_CODE_FAILURE
  • Type: http
const err = new chromiumNetErrors.HttpResponseCodeFailureError();
// or
const Err = chromiumNetErrors.getErrorByCode(-379);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('HTTP_RESPONSE_CODE_FAILURE');
const err = new Err();

QuicCertRootNotKnownError

The certificate presented on a QUIC connection does not chain to a known root and the origin connected to is not on a list of domains where unknown roots are allowed.

  • Name: QuicCertRootNotKnownError
  • Code: -380
  • Description: QUIC_CERT_ROOT_NOT_KNOWN
  • Type: http
const err = new chromiumNetErrors.QuicCertRootNotKnownError();
// or
const Err = chromiumNetErrors.getErrorByCode(-380);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('QUIC_CERT_ROOT_NOT_KNOWN');
const err = new Err();

QuicGoawayRequestCanBeRetriedError

A GOAWAY frame has been received indicating that the request has not been processed and is therefore safe to retry on a different connection.

  • Name: QuicGoawayRequestCanBeRetriedError
  • Code: -381
  • Description: QUIC_GOAWAY_REQUEST_CAN_BE_RETRIED
  • Type: http
const err = new chromiumNetErrors.QuicGoawayRequestCanBeRetriedError();
// or
const Err = chromiumNetErrors.getErrorByCode(-381);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('QUIC_GOAWAY_REQUEST_CAN_BE_RETRIED');
const err = new Err();

CacheMissError

The cache does not have the requested entry.

  • Name: CacheMissError
  • Code: -400
  • Description: CACHE_MISS
  • Type: cache
const err = new chromiumNetErrors.CacheMissError();
// or
const Err = chromiumNetErrors.getErrorByCode(-400);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('CACHE_MISS');
const err = new Err();

CacheReadFailureError

Unable to read from the disk cache.

  • Name: CacheReadFailureError
  • Code: -401
  • Description: CACHE_READ_FAILURE
  • Type: cache
const err = new chromiumNetErrors.CacheReadFailureError();
// or
const Err = chromiumNetErrors.getErrorByCode(-401);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('CACHE_READ_FAILURE');
const err = new Err();

CacheWriteFailureError

Unable to write to the disk cache.

  • Name: CacheWriteFailureError
  • Code: -402
  • Description: CACHE_WRITE_FAILURE
  • Type: cache
const err = new chromiumNetErrors.CacheWriteFailureError();
// or
const Err = chromiumNetErrors.getErrorByCode(-402);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('CACHE_WRITE_FAILURE');
const err = new Err();

CacheOperationNotSupportedError

The operation is not supported for this entry.

  • Name: CacheOperationNotSupportedError
  • Code: -403
  • Description: CACHE_OPERATION_NOT_SUPPORTED
  • Type: cache
const err = new chromiumNetErrors.CacheOperationNotSupportedError();
// or
const Err = chromiumNetErrors.getErrorByCode(-403);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('CACHE_OPERATION_NOT_SUPPORTED');
const err = new Err();

CacheOpenFailureError

The disk cache is unable to open this entry.

  • Name: CacheOpenFailureError
  • Code: -404
  • Description: CACHE_OPEN_FAILURE
  • Type: cache
const err = new chromiumNetErrors.CacheOpenFailureError();
// or
const Err = chromiumNetErrors.getErrorByCode(-404);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('CACHE_OPEN_FAILURE');
const err = new Err();

CacheCreateFailureError

The disk cache is unable to create this entry.

  • Name: CacheCreateFailureError
  • Code: -405
  • Description: CACHE_CREATE_FAILURE
  • Type: cache
const err = new chromiumNetErrors.CacheCreateFailureError();
// or
const Err = chromiumNetErrors.getErrorByCode(-405);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('CACHE_CREATE_FAILURE');
const err = new Err();

CacheRaceError

Multiple transactions are racing to create disk cache entries. This is an internal error returned from the HttpCache to the HttpCacheTransaction that tells the transaction to restart the entry-creation logic because the state of the cache has changed.

  • Name: CacheRaceError
  • Code: -406
  • Description: CACHE_RACE
  • Type: cache
const err = new chromiumNetErrors.CacheRaceError();
// or
const Err = chromiumNetErrors.getErrorByCode(-406);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('CACHE_RACE');
const err = new Err();

CacheChecksumReadFailureError

The cache was unable to read a checksum record on an entry. This can be returned from attempts to read from the cache. It is an internal error, returned by the SimpleCache backend, but not by any URLRequest methods or members.

  • Name: CacheChecksumReadFailureError
  • Code: -407
  • Description: CACHE_CHECKSUM_READ_FAILURE
  • Type: cache
const err = new chromiumNetErrors.CacheChecksumReadFailureError();
// or
const Err = chromiumNetErrors.getErrorByCode(-407);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('CACHE_CHECKSUM_READ_FAILURE');
const err = new Err();

CacheChecksumMismatchError

The cache found an entry with an invalid checksum. This can be returned from attempts to read from the cache. It is an internal error, returned by the SimpleCache backend, but not by any URLRequest methods or members.

  • Name: CacheChecksumMismatchError
  • Code: -408
  • Description: CACHE_CHECKSUM_MISMATCH
  • Type: cache
const err = new chromiumNetErrors.CacheChecksumMismatchError();
// or
const Err = chromiumNetErrors.getErrorByCode(-408);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('CACHE_CHECKSUM_MISMATCH');
const err = new Err();

CacheLockTimeoutError

Internal error code for the HTTP cache. The cache lock timeout has fired.

  • Name: CacheLockTimeoutError
  • Code: -409
  • Description: CACHE_LOCK_TIMEOUT
  • Type: cache
const err = new chromiumNetErrors.CacheLockTimeoutError();
// or
const Err = chromiumNetErrors.getErrorByCode(-409);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('CACHE_LOCK_TIMEOUT');
const err = new Err();

CacheAuthFailureAfterReadError

Received a challenge after the transaction has read some data, and the credentials aren't available. There isn't a way to get them at that point.

  • Name: CacheAuthFailureAfterReadError
  • Code: -410
  • Description: CACHE_AUTH_FAILURE_AFTER_READ
  • Type: cache
const err = new chromiumNetErrors.CacheAuthFailureAfterReadError();
// or
const Err = chromiumNetErrors.getErrorByCode(-410);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('CACHE_AUTH_FAILURE_AFTER_READ');
const err = new Err();

CacheEntryNotSuitableError

Internal not-quite error code for the HTTP cache. In-memory hints suggest that the cache entry would not have been useable with the transaction's current configuration (e.g. load flags, mode, etc.)

  • Name: CacheEntryNotSuitableError
  • Code: -411
  • Description: CACHE_ENTRY_NOT_SUITABLE
  • Type: cache
const err = new chromiumNetErrors.CacheEntryNotSuitableError();
// or
const Err = chromiumNetErrors.getErrorByCode(-411);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('CACHE_ENTRY_NOT_SUITABLE');
const err = new Err();

CacheDoomFailureError

The disk cache is unable to doom this entry.

  • Name: CacheDoomFailureError
  • Code: -412
  • Description: CACHE_DOOM_FAILURE
  • Type: cache
const err = new chromiumNetErrors.CacheDoomFailureError();
// or
const Err = chromiumNetErrors.getErrorByCode(-412);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('CACHE_DOOM_FAILURE');
const err = new Err();

CacheOpenOrCreateFailureError

The disk cache is unable to open or create this entry.

  • Name: CacheOpenOrCreateFailureError
  • Code: -413
  • Description: CACHE_OPEN_OR_CREATE_FAILURE
  • Type: cache
const err = new chromiumNetErrors.CacheOpenOrCreateFailureError();
// or
const Err = chromiumNetErrors.getErrorByCode(-413);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('CACHE_OPEN_OR_CREATE_FAILURE');
const err = new Err();

InsecureResponseError

The server's response was insecure (e.g. there was a cert error).

  • Name: InsecureResponseError
  • Code: -501
  • Description: INSECURE_RESPONSE
  • Type: unknown
const err = new chromiumNetErrors.InsecureResponseError();
// or
const Err = chromiumNetErrors.getErrorByCode(-501);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('INSECURE_RESPONSE');
const err = new Err();

NoPrivateKeyForCertError

An attempt to import a client certificate failed, as the user's key database lacked a corresponding private key.

  • Name: NoPrivateKeyForCertError
  • Code: -502
  • Description: NO_PRIVATE_KEY_FOR_CERT
  • Type: unknown
const err = new chromiumNetErrors.NoPrivateKeyForCertError();
// or
const Err = chromiumNetErrors.getErrorByCode(-502);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('NO_PRIVATE_KEY_FOR_CERT');
const err = new Err();

AddUserCertFailedError

An error adding a certificate to the OS certificate database.

  • Name: AddUserCertFailedError
  • Code: -503
  • Description: ADD_USER_CERT_FAILED
  • Type: unknown
const err = new chromiumNetErrors.AddUserCertFailedError();
// or
const Err = chromiumNetErrors.getErrorByCode(-503);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('ADD_USER_CERT_FAILED');
const err = new Err();

InvalidSignedExchangeError

An error occurred while handling a signed exchange.

  • Name: InvalidSignedExchangeError
  • Code: -504
  • Description: INVALID_SIGNED_EXCHANGE
  • Type: unknown
const err = new chromiumNetErrors.InvalidSignedExchangeError();
// or
const Err = chromiumNetErrors.getErrorByCode(-504);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('INVALID_SIGNED_EXCHANGE');
const err = new Err();

InvalidWebBundleError

An error occurred while handling a Web Bundle source.

  • Name: InvalidWebBundleError
  • Code: -505
  • Description: INVALID_WEB_BUNDLE
  • Type: unknown
const err = new chromiumNetErrors.InvalidWebBundleError();
// or
const Err = chromiumNetErrors.getErrorByCode(-505);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('INVALID_WEB_BUNDLE');
const err = new Err();

TrustTokenOperationFailedError

A Trust Tokens protocol operation-executing request failed for one of a number of reasons (precondition failure, internal error, bad response).

  • Name: TrustTokenOperationFailedError
  • Code: -506
  • Description: TRUST_TOKEN_OPERATION_FAILED
  • Type: unknown
const err = new chromiumNetErrors.TrustTokenOperationFailedError();
// or
const Err = chromiumNetErrors.getErrorByCode(-506);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('TRUST_TOKEN_OPERATION_FAILED');
const err = new Err();

TrustTokenOperationSuccessWithoutSendingRequestError

When handling a Trust Tokens protocol operation-executing request, the system was able to execute the request's Trust Tokens operation without sending the request to its destination: for instance, the results could have been present in a local cache (for redemption) or the operation could have been diverted to a local provider (for "platform-provided" issuance).

  • Name: TrustTokenOperationSuccessWithoutSendingRequestError
  • Code: -507
  • Description: TRUST_TOKEN_OPERATION_SUCCESS_WITHOUT_SENDING_REQUEST
  • Type: unknown
const err = new chromiumNetErrors.TrustTokenOperationSuccessWithoutSendingRequestError();
// or
const Err = chromiumNetErrors.getErrorByCode(-507);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('TRUST_TOKEN_OPERATION_SUCCESS_WITHOUT_SENDING_REQUEST');
const err = new Err();

FtpFailedError

A generic error for failed FTP control connection command. If possible, please use or add a more specific error code.

  • Name: FtpFailedError
  • Code: -601
  • Description: FTP_FAILED
  • Type: ftp
const err = new chromiumNetErrors.FtpFailedError();
// or
const Err = chromiumNetErrors.getErrorByCode(-601);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('FTP_FAILED');
const err = new Err();

FtpServiceUnavailableError

The server cannot fulfill the request at this point. This is a temporary error. FTP response code 421.

  • Name: FtpServiceUnavailableError
  • Code: -602
  • Description: FTP_SERVICE_UNAVAILABLE
  • Type: ftp
const err = new chromiumNetErrors.FtpServiceUnavailableError();
// or
const Err = chromiumNetErrors.getErrorByCode(-602);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('FTP_SERVICE_UNAVAILABLE');
const err = new Err();

FtpTransferAbortedError

The server has aborted the transfer. FTP response code 426.

  • Name: FtpTransferAbortedError
  • Code: -603
  • Description: FTP_TRANSFER_ABORTED
  • Type: ftp
const err = new chromiumNetErrors.FtpTransferAbortedError();
// or
const Err = chromiumNetErrors.getErrorByCode(-603);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('FTP_TRANSFER_ABORTED');
const err = new Err();

FtpFileBusyError

The file is busy, or some other temporary error condition on opening the file. FTP response code 450.

  • Name: FtpFileBusyError
  • Code: -604
  • Description: FTP_FILE_BUSY
  • Type: ftp
const err = new chromiumNetErrors.FtpFileBusyError();
// or
const Err = chromiumNetErrors.getErrorByCode(-604);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('FTP_FILE_BUSY');
const err = new Err();

FtpSyntaxError

Server rejected our command because of syntax errors. FTP response codes 500, 501.

  • Name: FtpSyntaxError
  • Code: -605
  • Description: FTP_SYNTAX_ERROR
  • Type: ftp
const err = new chromiumNetErrors.FtpSyntaxError();
// or
const Err = chromiumNetErrors.getErrorByCode(-605);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('FTP_SYNTAX_ERROR');
const err = new Err();

FtpCommandNotSupportedError

Server does not support the command we issued. FTP response codes 502, 504.

  • Name: FtpCommandNotSupportedError
  • Code: -606
  • Description: FTP_COMMAND_NOT_SUPPORTED
  • Type: ftp
const err = new chromiumNetErrors.FtpCommandNotSupportedError();
// or
const Err = chromiumNetErrors.getErrorByCode(-606);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('FTP_COMMAND_NOT_SUPPORTED');
const err = new Err();

FtpBadCommandSequenceError

Server rejected our command because we didn't issue the commands in right order. FTP response code 503.

  • Name: FtpBadCommandSequenceError
  • Code: -607
  • Description: FTP_BAD_COMMAND_SEQUENCE
  • Type: ftp
const err = new chromiumNetErrors.FtpBadCommandSequenceError();
// or
const Err = chromiumNetErrors.getErrorByCode(-607);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('FTP_BAD_COMMAND_SEQUENCE');
const err = new Err();

Pkcs12ImportBadPasswordError

PKCS #12 import failed due to incorrect password.

  • Name: Pkcs12ImportBadPasswordError
  • Code: -701
  • Description: PKCS12_IMPORT_BAD_PASSWORD
  • Type: certificate-manager
const err = new chromiumNetErrors.Pkcs12ImportBadPasswordError();
// or
const Err = chromiumNetErrors.getErrorByCode(-701);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('PKCS12_IMPORT_BAD_PASSWORD');
const err = new Err();

Pkcs12ImportFailedError

PKCS #12 import failed due to other error.

  • Name: Pkcs12ImportFailedError
  • Code: -702
  • Description: PKCS12_IMPORT_FAILED
  • Type: certificate-manager
const err = new chromiumNetErrors.Pkcs12ImportFailedError();
// or
const Err = chromiumNetErrors.getErrorByCode(-702);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('PKCS12_IMPORT_FAILED');
const err = new Err();

ImportCaCertNotCaError

CA import failed - not a CA cert.

  • Name: ImportCaCertNotCaError
  • Code: -703
  • Description: IMPORT_CA_CERT_NOT_CA
  • Type: certificate-manager
const err = new chromiumNetErrors.ImportCaCertNotCaError();
// or
const Err = chromiumNetErrors.getErrorByCode(-703);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('IMPORT_CA_CERT_NOT_CA');
const err = new Err();

ImportCertAlreadyExistsError

Import failed - certificate already exists in database. Note it's a little weird this is an error but reimporting a PKCS12 is ok (no-op). That's how Mozilla does it, though.

  • Name: ImportCertAlreadyExistsError
  • Code: -704
  • Description: IMPORT_CERT_ALREADY_EXISTS
  • Type: certificate-manager
const err = new chromiumNetErrors.ImportCertAlreadyExistsError();
// or
const Err = chromiumNetErrors.getErrorByCode(-704);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('IMPORT_CERT_ALREADY_EXISTS');
const err = new Err();

ImportCaCertFailedError

CA import failed due to some other error.

  • Name: ImportCaCertFailedError
  • Code: -705
  • Description: IMPORT_CA_CERT_FAILED
  • Type: certificate-manager
const err = new chromiumNetErrors.ImportCaCertFailedError();
// or
const Err = chromiumNetErrors.getErrorByCode(-705);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('IMPORT_CA_CERT_FAILED');
const err = new Err();

ImportServerCertFailedError

Server certificate import failed due to some internal error.

  • Name: ImportServerCertFailedError
  • Code: -706
  • Description: IMPORT_SERVER_CERT_FAILED
  • Type: certificate-manager
const err = new chromiumNetErrors.ImportServerCertFailedError();
// or
const Err = chromiumNetErrors.getErrorByCode(-706);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('IMPORT_SERVER_CERT_FAILED');
const err = new Err();

Pkcs12ImportInvalidMacError

PKCS #12 import failed due to invalid MAC.

  • Name: Pkcs12ImportInvalidMacError
  • Code: -707
  • Description: PKCS12_IMPORT_INVALID_MAC
  • Type: certificate-manager
const err = new chromiumNetErrors.Pkcs12ImportInvalidMacError();
// or
const Err = chromiumNetErrors.getErrorByCode(-707);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('PKCS12_IMPORT_INVALID_MAC');
const err = new Err();

Pkcs12ImportInvalidFileError

PKCS #12 import failed due to invalid/corrupt file.

  • Name: Pkcs12ImportInvalidFileError
  • Code: -708
  • Description: PKCS12_IMPORT_INVALID_FILE
  • Type: certificate-manager
const err = new chromiumNetErrors.Pkcs12ImportInvalidFileError();
// or
const Err = chromiumNetErrors.getErrorByCode(-708);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('PKCS12_IMPORT_INVALID_FILE');
const err = new Err();

Pkcs12ImportUnsupportedError

PKCS #12 import failed due to unsupported features.

  • Name: Pkcs12ImportUnsupportedError
  • Code: -709
  • Description: PKCS12_IMPORT_UNSUPPORTED
  • Type: certificate-manager
const err = new chromiumNetErrors.Pkcs12ImportUnsupportedError();
// or
const Err = chromiumNetErrors.getErrorByCode(-709);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('PKCS12_IMPORT_UNSUPPORTED');
const err = new Err();

KeyGenerationFailedError

Key generation failed.

  • Name: KeyGenerationFailedError
  • Code: -710
  • Description: KEY_GENERATION_FAILED
  • Type: certificate-manager
const err = new chromiumNetErrors.KeyGenerationFailedError();
// or
const Err = chromiumNetErrors.getErrorByCode(-710);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('KEY_GENERATION_FAILED');
const err = new Err();

PrivateKeyExportFailedError

Failure to export private key.

  • Name: PrivateKeyExportFailedError
  • Code: -712
  • Description: PRIVATE_KEY_EXPORT_FAILED
  • Type: certificate-manager
const err = new chromiumNetErrors.PrivateKeyExportFailedError();
// or
const Err = chromiumNetErrors.getErrorByCode(-712);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('PRIVATE_KEY_EXPORT_FAILED');
const err = new Err();

SelfSignedCertGenerationFailedError

Self-signed certificate generation failed.

  • Name: SelfSignedCertGenerationFailedError
  • Code: -713
  • Description: SELF_SIGNED_CERT_GENERATION_FAILED
  • Type: certificate-manager
const err = new chromiumNetErrors.SelfSignedCertGenerationFailedError();
// or
const Err = chromiumNetErrors.getErrorByCode(-713);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('SELF_SIGNED_CERT_GENERATION_FAILED');
const err = new Err();

CertDatabaseChangedError

The certificate database changed in some way.

  • Name: CertDatabaseChangedError
  • Code: -714
  • Description: CERT_DATABASE_CHANGED
  • Type: certificate-manager
const err = new chromiumNetErrors.CertDatabaseChangedError();
// or
const Err = chromiumNetErrors.getErrorByCode(-714);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('CERT_DATABASE_CHANGED');
const err = new Err();

DnsMalformedResponseError

DNS resolver received a malformed response.

  • Name: DnsMalformedResponseError
  • Code: -800
  • Description: DNS_MALFORMED_RESPONSE
  • Type: dns
const err = new chromiumNetErrors.DnsMalformedResponseError();
// or
const Err = chromiumNetErrors.getErrorByCode(-800);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('DNS_MALFORMED_RESPONSE');
const err = new Err();

DnsServerRequiresTcpError

DNS server requires TCP

  • Name: DnsServerRequiresTcpError
  • Code: -801
  • Description: DNS_SERVER_REQUIRES_TCP
  • Type: dns
const err = new chromiumNetErrors.DnsServerRequiresTcpError();
// or
const Err = chromiumNetErrors.getErrorByCode(-801);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('DNS_SERVER_REQUIRES_TCP');
const err = new Err();

DnsServerFailedError

DNS server failed. This error is returned for all of the following error conditions: 1 - Format error - The name server was unable to interpret the query. 2 - Server failure - The name server was unable to process this query due to a problem with the name server. 4 - Not Implemented - The name server does not support the requested kind of query. 5 - Refused - The name server refuses to perform the specified operation for policy reasons.

  • Name: DnsServerFailedError
  • Code: -802
  • Description: DNS_SERVER_FAILED
  • Type: dns
const err = new chromiumNetErrors.DnsServerFailedError();
// or
const Err = chromiumNetErrors.getErrorByCode(-802);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('DNS_SERVER_FAILED');
const err = new Err();

DnsTimedOutError

DNS transaction timed out.

  • Name: DnsTimedOutError
  • Code: -803
  • Description: DNS_TIMED_OUT
  • Type: dns
const err = new chromiumNetErrors.DnsTimedOutError();
// or
const Err = chromiumNetErrors.getErrorByCode(-803);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('DNS_TIMED_OUT');
const err = new Err();

DnsCacheMissError

The entry was not found in cache or other local sources, for lookups where only local sources were queried. TODO(ericorth): Consider renaming to DNS_LOCAL_MISS or something like that as the cache is not necessarily queried either.

  • Name: DnsCacheMissError
  • Code: -804
  • Description: DNS_CACHE_MISS
  • Type: dns
const err = new chromiumNetErrors.DnsCacheMissError();
// or
const Err = chromiumNetErrors.getErrorByCode(-804);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('DNS_CACHE_MISS');
const err = new Err();

DnsSearchEmptyError

Suffix search list rules prevent resolution of the given host name.

  • Name: DnsSearchEmptyError
  • Code: -805
  • Description: DNS_SEARCH_EMPTY
  • Type: dns
const err = new chromiumNetErrors.DnsSearchEmptyError();
// or
const Err = chromiumNetErrors.getErrorByCode(-805);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('DNS_SEARCH_EMPTY');
const err = new Err();

DnsSortError

Failed to sort addresses according to RFC3484.

  • Name: DnsSortError
  • Code: -806
  • Description: DNS_SORT_ERROR
  • Type: dns
const err = new chromiumNetErrors.DnsSortError();
// or
const Err = chromiumNetErrors.getErrorByCode(-806);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('DNS_SORT_ERROR');
const err = new Err();

DnsSecureResolverHostnameResolutionFailedError

Failed to resolve the hostname of a DNS-over-HTTPS server.

  • Name: DnsSecureResolverHostnameResolutionFailedError
  • Code: -808
  • Description: DNS_SECURE_RESOLVER_HOSTNAME_RESOLUTION_FAILED
  • Type: dns
const err = new chromiumNetErrors.DnsSecureResolverHostnameResolutionFailedError();
// or
const Err = chromiumNetErrors.getErrorByCode(-808);
const err = new Err();
// or
const Err = chromiumNetErrors.getErrorByDescription('DNS_SECURE_RESOLVER_HOSTNAME_RESOLUTION_FAILED');
const err = new Err();

Author: Maxkueng
Source Code: https://github.com/maxkueng/chromium-net-errors 
License: MIT license

#electron #node #error 

Dario  Schaden

Dario Schaden

1625606220

Make YOUR OWN Programming Language - EP 6 - IF statement

Hello and welcome to the sixth episode on how to create your VERY OWN programming language in Python.

In this episode we add in the IF statement and in the next two episodes we will be adding in the FOR and WHILE statements. After that we’ll be finally implementing functions!

If you have any questions or problems, leave a comment below! I will try reply as soon as possible! And don’t forget to leave a like if you enjoyed the video :)

LINKS

Python3 - https://www.python.org/downloads/
This series is loosely based on https://ruslanspivak.com/lsbasi-part1/

ALL CODE IS ON GITHUB

https://github.com/davidcallanan/py-basicinterp

Consider supporting me via PATREON

https://www.patreon.com/CodePulse

Uncle Bob Clean Architecture book: https://read.amazon.co.uk/kp/embed?asin=B075LRM681&preview=newtab&linkCode=kpe&ref_=cm_sw_r_kb_dp_zbbTDb7E1P022&tag=davidcallanan-20 (affiliate link)

#python #your own programming language #if statement