Diego  Bernhard

Diego Bernhard


CORS in Flask

Dealing with cross origin requests is common in APIs. In this video I show you how to handle CORS errors in case you get them.

Get the code here: https://prettyprinted.com/l/HUv

#flask #python

What is GEEK

Buddha Community

CORS in Flask
Steve  Kunde

Steve Kunde


Download a Flask template ready to plug in your business logic

Let’s assume after lots of hard work you have your machine learning model running the way it should. This model could be one which responds to a user’s request to classify a tweet sentiment or identify objects in an image or recommend a product or some other algorithm unique to your needs. You would now like to quickly deploy this model. The article below is an explanation of the template that I have created to get you up and running quickly.

#flask-framework #flask-python-appengine #flask-sqlalchemy #marshmallow #flask #programming

Flask-CORS: Cross Origin Resource Sharing Support for Flask


A Flask extension for handling Cross Origin Resource Sharing (CORS), making cross-origin AJAX possible.

This package has a simple philosophy: when you want to enable CORS, you wish to enable it for all use cases on a domain. This means no mucking around with different allowed headers, methods, etc.

By default, submission of cookies across domains is disabled due to the security implications. Please see the documentation for how to enable credential'ed requests, and please make sure you add some sort of CSRF protection before doing so!


Install the extension with using pip, or easy_install.

$ pip install -U flask-cors


This package exposes a Flask extension which by default enables CORS support on all routes, for all origins and methods. It allows parameterization of all CORS headers on a per-resource level. The package also contains a decorator, for those who prefer this approach.

Simple Usage

In the simplest case, initialize the Flask-Cors extension with default arguments in order to allow CORS for all domains on all routes. See the full list of options in the documentation.

from flask import Flask
from flask_cors import CORS

app = Flask(__name__)

def helloWorld():
  return "Hello, cross-origin-world!"

Resource specific CORS

Alternatively, you can specify CORS options on a resource and origin level of granularity by passing a dictionary as the resources option, mapping paths to a set of options. See the full list of options in the documentation.

app = Flask(__name__)
cors = CORS(app, resources={r"/api/*": {"origins": "*"}})

def list_users():
  return "user example"

Route specific CORS via decorator

This extension also exposes a simple decorator to decorate flask routes with. Simply add @cross_origin() below a call to Flask's @app.route(..) to allow CORS on a given route. See the full list of options in the decorator documentation.

def helloWorld():
  return "Hello, cross-origin-world!"


For a full list of options, please see the full documentation


If things aren't working as you expect, enable logging to help understand what is going on under the hood, and why.

logging.getLogger('flask_cors').level = logging.DEBUG


A simple set of tests is included in test/. To run, install nose, and simply invoke nosetests or python setup.py test to exercise the tests.


Questions, comments or improvements? Please create an issue on Github, tweet at @corydolphin or send me an email. I do my best to include every contribution proposed in any way that I can.


This Flask extension is based upon the Decorator for the HTTP Access Control written by Armin Ronacher.

Download Details:
Author: corydolphin
Source Code: https://github.com/corydolphin/flask-cors
License: MIT License

#flask #python #cors #ajax 

Web development with python and flask: part 3

In this part of the series, we will be taking a look at the HTTP protocol, request/response objects, their application in flask, properties, and their related methods. We will take steps to import it from the flask module, use its properties, and look at some of its related usages

Web applications implement one of the internet data and message exchange architectures that is based on HTTP protocol. The HTTP protocol is just one of the many application layers of TCP/IP. The TCP/IP(Transmission Control Protocol/Internet Protocol) is used as a standard for transmitting data over networks. In simple terms, HTTP has rules, properties, and methods that implement the transmission of messages in form of hyperlinks over the communication structures enforced by the TCP/IP.

.You must know that the internet is based on connected physical computational devices over either copper wires, fiber optical cables, wireless, and other media to form data transmission and retrieval systems across the globe. Trust me, that is a whole career field in itself and we are not interested in its elaborate ramblings in this post.

#flask #web developemnt #flask #flask requests #webdevelopment

Trystan  Doyle

Trystan Doyle


Python Flask-Mail Library to Send Emails in Browser Using Flask Full Project For Beginners

Python Flask-Mail Library to Send Emails in Browser Using Flask Full Project For Beginners

#python #flask #flaskmail

Welcome Folks My name is Gautam and Welcome to Coding Shiksha a Place for All Programmers. You can learn Web Development and Programming Tutorials.

#python flask-mail #flask full project #programming #flask

Bryon  Sporer

Bryon Sporer


Building REST APIs using Flask-RESTPlus, SQLAlchemy & Marshmallow

Python is an interpreted, high-level, and general-purpose programming language. It can be used to develop business applications as well as system scripts, has data science related capabilities, desktop GUIs, and also offers many choices for web and internet development.
Flask is a micro web framework written in Python that helps you build web applications easily. It does not require tools or libraries and has no database abstraction layer, form validation, serializers, user management, or built-in internationalization. However, it supports extensions that can add application features as if they were implemented in Flask itself. An aspiring Flask developer must then choose the right extensions and combine them together to get the right set of functions, as applicable.
The aim of this tutorial is working with Flask extensions that help us create a production environment ready Python application and to integrate with Swagger UI without a hitch. We will learn to build a Rest API using Flask extensions such as Flask-RestPlus, Flask-Marshmallow, and Flask-SQLAlchemy and share the API using Swagger UI.
Flask and Flask-RestPlus
Flask is a lightweight web server and framework. Although, we can create a Web API directly with flask, the Flask-RESTPlus extension makes it simpler to build Rest APIs.
It supports namespaces, which are ways of creating prefixes and structuring the code.
It has a full solution for parsing and validating the input parameters. This means that we have an easy way of dealing with endpoints that require several parameters and validate them.
Its best feature is the ability to automatically generate interactive documentation for our API using Swagger UI.
Marshmallow is an ORM/ODM/framework-agnostic library developed to simplify the process of serialization and deserialization. The Flask-Marshmallow extension acts as a thin integration layer for Flask and Marshmallow that adds additional features to Marshmallow, including URL and hyperlink fields for HATEOAS-ready APIs. It also integrates with Flask-SQLAlchemy and reduces some boilerplate code.

#flask-restful #flask #flask-sqlalchemy #python3