Axios HTTP Client Example | Axios POST, GET Requests

Axios HTTP Client is the Promise based HTTP client for the browser and node.js. Axios HTTP Client will teach you how to use Axios POST request to the server or Axios GET request to fetch the data. It supports all modern browsers, including support for IE8 and higher.

It is promise-based, and this lets us write async/await code to perform XHR requests very quickly. Using Axios, It is effortless to send an asynchronous HTTP request to the server or REST endpoints and perform any CRUD operations.

Javascript Axios library can be used in your everyday JavaScript application or can be used together with more advanced frameworks like  Vue.js,  Angular, or  Node.js.

Axios has lots of advantages over the native  Fetch API:

• It supports older browsers (Fetch needs a polyfill)
• It has a way to abort a request.
• It has a way to set a response timeout.
• It has built-in CSRF protection.
• It supports upload progress.
• It performs automatic JSON data transformation.
• It works with Node.js very well.

In this tutorial, you’ll learn how to install and add Axios to your project and perform an asynchronous HTTP request. We’ll cover a real-world scenario throughout this example.

#javascript axios #axios http client #node.js #vue.js #angular

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Axios HTTP Client Example | Axios POST, GET Requests

Axios HTTP Client is the Promise based HTTP client for the browser and node.js. Axios HTTP Client will teach you how to use Axios POST request to the server or Axios GET request to fetch the data. It supports all modern browsers, including support for IE8 and higher.

It is promise-based, and this lets us write async/await code to perform XHR requests very quickly. Using Axios, It is effortless to send an asynchronous HTTP request to the server or REST endpoints and perform any CRUD operations.

Javascript Axios library can be used in your everyday JavaScript application or can be used together with more advanced frameworks like  Vue.js,  Angular, or  Node.js.

Axios has lots of advantages over the native  Fetch API:

• It supports older browsers (Fetch needs a polyfill)
• It has a way to abort a request.
• It has a way to set a response timeout.
• It has built-in CSRF protection.
• It supports upload progress.
• It performs automatic JSON data transformation.
• It works with Node.js very well.

In this tutorial, you’ll learn how to install and add Axios to your project and perform an asynchronous HTTP request. We’ll cover a real-world scenario throughout this example.

#javascript axios #axios http client #node.js #vue.js #angular

6 Things About HTTP Request in Dart For Beginners

Introduction

If you are here and a beginner, that means you want to learn everything about making an API request using Dart in Flutter, then you are in the right place for the HTTP tutorial. So without wasting any time, let’s start with this flutter tutorial. We will cover the essential topics required to work with the HTTP request in Dart.

What is Rest API in Dart ?

Rest APIs are a way to fetch data from the internet in flutter or communicate the server from the app and get some essential information from your server to the app. This information can be regarding your app’s data, user’s data, or any data you want to share globally from your app to all of your users.

This HTTP request fetches in a unique JSON format, and then the information is fetched from the JSON and put in the UI of the app.

Every programming language has a way of some internet connectivity i.e, use this rest API developed on the server and fetch data from the internet. To use this request feature, we have to add HTTP package in flutter, add this flutter package add in your project to use the http feature. Add this HTTP package to your pubspec.yaml, and run a command in terminal :

flutter packages get

#dart #flutter #async await #async function #cancel http api request in flutter #fetch data from the internet #flutter cancel future #flutter get request example #flutter post request example #future of flutter #http tutorial

HTTP requests using Axios

The most common way for frontend programs to communicate with servers is through the HTTP protocol. You are probably familiar with the Fetch API and the XMLHttpRequest interface, which allow you fetch resources and make HTTP requests.

If you are using a JavaScript library, chances are it comes with a client HTTP API. jQuery’s $.ajax() function, for example, has been particularly popular with frontend developers. But as developers move away from such libraries in favor of native APIs, dedicated HTTP clients have emerged to fill the gap.

In this post we will take a good look at Axios, a client HTTP API based on the XMLHttpRequest interface provided by browsers, and examine the key features that has contributed to its rise in popularity among frontend developers.

Why Axios?

As with Fetch, Axios is promise-based. However, it provides a more powerful and flexible feature set. Advantages over the native Fetch API include:

• Request and response interception
• Streamlined error handling
• Protection against XSRF
• Support for upload progress
• Response timeout
• The ability to cancel requests
• Support for older browsers
• Automatic JSON data transformation

Installation

You can install Axios using:

• npm:

$ npm install axios

• The Bower package manager:

$ bower install axios

• Or a content delivery network:

<script src="https://unpkg.com/axios/dist/axios.min.js"></script>

Making requests

Making an HTTP request is as easy as passing a config object to the Axios function. In its simplest form, the object must have a url property; if no method is provided, GET will be used as the default value. Let’s look at a simple example:

// send a POST request
axios({
  method: 'post',
  url: '/login',
  data: {
    firstName: 'Finn',
    lastName: 'Williams'
  }
});

This should look familiar to those who have worked with jQuery’s $.ajax function. This code is simply instructing Axios to send a POST request to /login with an object of key/value pairs as its data. Axios will automatically convert the data to JSON and send it as the request body.

Shorthand methods

Axios also provides a set of shorthand methods for performing different types of requests. The methods are as follows:

• axios.request(config)
• axios.get(url[, config])
• axios.delete(url[, config])
• axios.head(url[, config])
• axios.options(url[, config])
• axios.post(url[, data[, config]])
• axios.put(url[, data[, config]])
• axios.patch(url[, data[, config]])

For instance, the following code shows how the previous example could be written using the axios.post() method:

axios.post('/login', {
  firstName: 'Finn',
  lastName: 'Williams'
});

Handling the response

Once an HTTP request is made, Axios returns a promise that is either fulfilled or rejected, depending on the response from the backend service. To handle the result, you can use the then() method like this:

axios.post('/login', {
  firstName: 'Finn',
  lastName: 'Williams'
})
.then((response) => {
  console.log(response);
}, (error) => {
  console.log(error);
});

If the promise is fulfilled, the first argument of then() will be called; if the promise is rejected, the second argument will be called. According to the documentation, the fulfillment value is an object containing the following information:

{
  // `data` is the response that was provided by the server
  data: {},
 
  // `status` is the HTTP status code from the server response
  status: 200,
 
  // `statusText` is the HTTP status message from the server response
  statusText: 'OK',
 
  // `headers` the headers that the server responded with
  // All header names are lower cased
  headers: {},
 
  // `config` is the config that was provided to `axios` for the request
  config: {},
 
  // `request` is the request that generated this response
  // It is the last ClientRequest instance in node.js (in redirects)
  // and an XMLHttpRequest instance the browser
  request: {}
}

As an example, here’s how the response looks when requesting data from the GitHub API:

axios.get('https://api.github.com/users/mapbox')
  .then((response) => {
    console.log(response.data);
    console.log(response.status);
    console.log(response.statusText);
    console.log(response.headers);
    console.log(response.config);
  });

// logs:
// => {login: "mapbox", id: 600935, node_id: "MDEyOk9yZ2FuaXphdGlvbjYwMDkzNQ==", avatar_url: "https://avatars1.githubusercontent.com/u/600935?v=4", gravatar_id: "", …}
// => 200
// => OK
// => {x-ratelimit-limit: "60", x-github-media-type: "github.v3", x-ratelimit-remaining: "60", last-modified: "Wed, 01 Aug 2018 02:50:03 GMT", etag: "W/"3062389570cc468e0b474db27046e8c9"", …}
// => {adapter: ƒ, transformRequest: {…}, transformResponse: {…}, timeout: 0, xsrfCookieName: "XSRF-TOKEN", …}

Making simultaneous requests

One of Axios’ more interesting features is its ability to make multiple requests in parallel by passing an array of arguments to the axios.all() method. This method returns a single promise object that resolves only when all arguments passed as an array have resolved. Here’s a simple example:

// execute simultaneous requests 
axios.all([
  axios.get('https://api.github.com/users/mapbox'),
  axios.get('https://api.github.com/users/phantomjs')
])
.then(responseArr => {
  //this will be executed only when all requests are complete
  console.log('Date created: ', responseArr[0].data.created_at);
  console.log('Date created: ', responseArr[1].data.created_at);
});

// logs:
// => Date created:  2011-02-04T19:02:13Z
// => Date created:  2017-04-03T17:25:46Z

This code makes two requests to the GitHub API and then logs the value of the created_at property of each response to the console. Keep in mind that if any of the arguments rejects then the promise will immediately reject with the reason of the first promise that rejects.

For convenience, Axios also provides a method called axios.spread() to assign the properties of the response array to separate variables. Here’s how you could use this method:

axios.all([
  axios.get('https://api.github.com/users/mapbox'),
  axios.get('https://api.github.com/users/phantomjs')
])
.then(axios.spread((user1, user2) => {
  console.log('Date created: ', user1.data.created_at);
  console.log('Date created: ', user2.data.created_at);
}));

// logs:
// => Date created:  2011-02-04T19:02:13Z
// => Date created:  2017-04-03T17:25:46Z

The output of this code is the same as the previous example. The only difference is that the axios.spread() method is used to unpack values from the response array.

Sending custom headers

Sending custom headers with Axios is very straightforward. Simply pass an object containing the headers as the last argument. For example:

const options = {
  headers: {'X-Custom-Header': 'value'}
};

axios.post('/save', { a: 10 }, options);

Transforming requests and responses

By default, Axios automatically converts requests and responses to JSON. But it also allows you to override the default behavior and define a different transformation mechanism. This ability is particularly useful when working with an API that accepts only a specific data format such as XML or CSV.

To change the request data before sending it to the server, set the transformRequest property in the config object. Note that this method only works for PUT, POST, and PATCH request methods. Here’s how you can do that:

const options = {
  method: 'post',
  url: '/login',
  data: {
    firstName: 'Finn',
    lastName: 'Williams'
  },
  transformRequest: [(data, headers) => {
    // transform the data

    return data;
  }]
};

// send the request
axios(options);

To modify the data before passing it to then() or catch(), you can set the transformResponse property:

const options = {
  method: 'post',
  url: '/login',
  data: {
    firstName: 'Finn',
    lastName: 'Williams'
  },
  transformResponse: [(data) => {
    // transform the response

    return data;
  }]
};

// send the request
axios(options);

Intercepting requests and responses

HTTP Interception is a popular feature of Axios. With this feature, you can examine and change HTTP requests from your program to the server and vice versa, which is very useful for a variety of implicit tasks, such as logging and authentication.

At first glance, interceptors look very much like transforms, but they differ in one key way: unlike transforms, which only receive the data and headers as arguments, interceptors receive the entire response object or request config.

You can declare a request interceptor in Axios like this:

// declare a request interceptor
axios.interceptors.request.use(config => {
  // perform a task before the request is sent
  console.log('Request was sent');

  return config;
}, error => {
  // handle the error
  return Promise.reject(error);
});

// sent a GET request
axios.get('https://api.github.com/users/mapbox')
  .then(response => {
    console.log(response.data.created_at);
  });

This code logs a message to the console whenever a request is sent then waits until it gets a response from the server, at which point it prints the time the account was created at GitHub to the console. One advantage of using interceptors is that you no longer have to implement tasks for each HTTP request separately.

Axios also provides a response interceptor, which allows you to transform the responses from a server on their way back to the application:

// declare a response interceptor
axios.interceptors.response.use((response) => {
  // do something with the response data
  console.log('Response was received');

  return response;
}, error => {
  // handle the response error
  return Promise.reject(error);
});

// sent a GET request
axios.get('https://api.github.com/users/mapbox')
  .then(response => {
    console.log(response.data.created_at);
  });

Client-side support for protection against XSRF

Cross-site request forgery (or XSRF for short) is a method of attacking a web-hosted app in which the attacker disguises himself as a legal and trusted user to influence the interaction between the app and the user’s browser. There are many ways to execute such an attack, including XMLHttpRequest.

Fortunately, Axios is designed to protect against XSRF by allowing you to embed additional authentication data when making requests. This enables the server to discover requests from unauthorized locations. Here’s how this can be done with Axios:

const options = {
  method: 'post',
  url: '/login',
  xsrfCookieName: 'XSRF-TOKEN',
  xsrfHeaderName: 'X-XSRF-TOKEN',
};

// send the request
axios(options);

While Axios has some features for debugging requests and responses, making sure Axios continues to serve resources to your app in production is where things get tougher. If you’re interested in ensuring requests to the backend or 3rd party services are successful, try LogRocket. [

LogRocket is like a DVR for web apps, recording literally everything that happens on your site. Instead of guessing why problems happen, you can aggregate and report on problematic Axios requests to quickly understand the root cause.

LogRocket instruments your app to record baseline performance timings such as page load time, time to first byte, and slow network requests as well as logs Redux, NgRx. and Vuex actions/state. Start monitoring for free.

Monitoring POST request progress

Another interesting feature of Axios is the ability to monitor request progress. This is especially useful when downloading or uploading large files. The provided example in the Axios documentation gives you a good idea of how that can be done. But for the sake of simplicity and style, we are going to use the Axios Progress Bar module in this tutorial.

The first thing we need to do to use this module is to include the related style and script:

<link rel="stylesheet" type="text/css" href="https://cdn.rawgit.com/rikmms/progress-bar-4-axios/0a3acf92/dist/nprogress.css" />

<script src="https://cdn.rawgit.com/rikmms/progress-bar-4-axios/0a3acf92/dist/index.js"></script>

Then we can implement the progress bar like this:

loadProgressBar()

const url = 'https://media.giphy.com/media/C6JQPEUsZUyVq/giphy.gif';

function downloadFile(url) {
  axios.get(url)
  .then(response => {
    console.log(response)
  })
  .catch(error => {
    console.log(error)
  })
}

downloadFile(url);

To change the default styling of the progress bar, we can override the following style rules:

#nprogress .bar {
    background: red !important;
}

#nprogress .peg {
    box-shadow: 0 0 10px red, 0 0 5px red !important;
}

#nprogress .spinner-icon {
    border-top-color: red !important;
    border-left-color: red !important;
}

Canceling requests

In some situations, you may no longer care about the result and want to cancel a request that’s already sent. This can be done by using a cancel token. The ability to cancel requests was added to Axios in version 1.5 and is based on the cancelable promises proposal. Here’s a simple example:

const source = axios.CancelToken.source();

axios.get('https://media.giphy.com/media/C6JQPEUsZUyVq/giphy.gif', {
  cancelToken: source.token
}).catch(thrown => {
  if (axios.isCancel(thrown)) {
    console.log(thrown.message);
  } else {
    // handle error
  }
});

// cancel the request (the message parameter is optional)
source.cancel('Request canceled.');

You can also create a cancel token by passing an executor function to the CancelToken constructor, as shown below:

const CancelToken = axios.CancelToken;
let cancel;

axios.get('https://media.giphy.com/media/C6JQPEUsZUyVq/giphy.gif', {
  // specify a cancel token
  cancelToken: new CancelToken(c => {
    // this function will receive a cancel function as a parameter
    cancel = c;
  })
}).catch(thrown => {
  if (axios.isCancel(thrown)) {
    console.log(thrown.message);
  } else {
    // handle error
  }
});

// cancel the request
cancel('Request canceled.');

Libraries

Axios’ rise in popularity among developers has resulted in a rich selection of third-party libraries that extend its functionality. From testers to loggers, there’s a library for almost any additional feature you may need when using Axios. Here are some popular libraries currently available:

• axios-vcr: 📼 Record and replay requests in JavaScript
• axios-response-logger: 📣 Axios interceptor which logs responses
• axios-method-override: ⛵️ Axios request method override plugin
• axios-extensions: 🍱 Axios extensions lib, including throttle and cache GET request features
• axios-api-versioning: Add easy-to-manage API versioning to Axios
• axios-cache-plugin: Helps you cache GET requests when using Axios
• axios-cookiejar-support: Add tough-cookie support to Axios
• react-hooks-axios: Custom React Hooks for Axios
• moxios: Mock Axios requests for testing
• redux-saga-requests: Redux-Saga add-on to simplify handling of AJAX requests
• axios-fetch: A Web API Fetch implementation backed by an Axios client
• axios-curlirize: Log any Axios request as a curl command in the console
• axios-actions: Bundle endpoints as callable, reusable services
• mocha-axios: HTTP assertions for Mocha using Axios
• axios-mock-adapter: Axios adapter that allows you to easily mock requests
• axios-debug-log: Axios interceptor of logging request and response with debug library
• redux-axios-middleware: Redux middleware for fetching data with Axios HTTP client
• axiosist: Axios-based supertest: convert nNode.js request handler to Axios adapter, used for Node.js server unit test

#Axios #programming #HTTP #HTTP requests

jQuery ajax get request method example

jQuery Ajax Get Request Method Example

This article is originally published at https://www.tutsmake.com/jquery-api-ajax-get-method-example/

Let’s see example of jquery ajax get request.

<html lang="en">
<head>
<meta charset="utf-8">
<title>jQuery Ajax GET Request Example</title>
<script src="https://code.jquery.com/jquery-3.3.1.min.js"></script> 
<style>  
.formClass
{
    padding: 15px;
    border: 12px solid #23384E;
    background: #28BAA2;
    margin-top: 10px;
} 
</style> 
<script type="text/javascript">
$(document).ready(function(){
   $("button").click(function(event){
 
    var name = "Tutsmake";
     
    $.get('https://www.tutsmake.com/Demos/html/ajax-get-method.php', {webname: name}, function(data){
 
        $("#output").html(data);
    });
 
  });
 
});
</script>
</head>
<body>
    <div class="formClass">
      <button type="button">Click &amp; Get Data</button><br>
      <div id="output">Hello</div>    
    </div>
</body>
</html>   ```                         

This article is originally published at [https://www.tutsmake.com/jquery-api-ajax-get-method-example/](https://www.tutsmake.com/jquery-api-ajax-get-method-example/ "https://www.tutsmake.com/jquery-api-ajax-get-method-example/")

#jquery #jquery ajax get request with parameters #ajax get method example #jquery ajax get request parameters #ajax

Angular HttpClient Module | Angular Http GET, POST Example

Angular 9 HttpClient is an inbuilt module that helps us to send network requests to any server. Angular HttpClientModule is used to send GET, POST, PUT, PATCH, and DELETE requests. Angular can consume REST API using the Angular HttpClient module. The latest version of the Angular framework is  Angular 9.

If you are new to Angular 9, then check out my  Angular 9 Tutorial in this blog. Most front-end applications communicate with the backend services over an HTTP protocol. Modern browsers support the two different APIs for making HTTP requests.

1. XMLHttpRequest interface and the
2. fetch() API.

We will use XMLHttpRequest for Angular application.

#angular #angular httpclient #angular http #post #get