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Flask-Cors 1.7.2

A Flask extension adding a decorator for CORS support

Latest Version: 2.1.0

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

Installation

Install the extension with using pip, or easy_install.

$ pip install flask-cors

Usage

This extension enables CORS support either via a decorator, or a Flask extension. There are three examples shown in the examples directory, showing the major use cases. The suggested configuration is the simple_example.py, or the app_example.py.

Simple Usage

In the simplest case, initialize the Flask-Cors extension with default arguments in order to allow CORS on all routes.

app = Flask(__name__)
cors = CORS(app)

@app.route("/")
def helloWorld():
  return "Hello, cross-origin-world!"

Resource specific CORS

Alternatively, a list of resources and associated settings for CORS can be supplied, selectively enables CORS support on a set of paths on your app.

Note: this resources parameter can also be set in your application’s config.

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

@app.route("/api/v1/users")
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(..) incanation to accept the default options and allow CORS on a given route.

@app.route("/")
@cross_origin() # allow all origins all methods.
def helloWorld():
  return "Hello, cross-origin-world!"

Using JSON with CORS

When using JSON cross origin, browsers will issue a pre-flight OPTIONS request for POST requests. In order for browsers to allow POST requests with a JSON content type, you must allow the Content-Type header. The simplest way to do this is to simply set the CORS_HEADERS configuration value on your application: e.g.

app.config['CORS_HEADERS'] = 'Content-Type'

Application-wide settings

Alternatively, you can set all parameters except automatic_options in an app’s config object. Setting these at the application level effectively changes the default value for your application, while still allowing you to override it on a per-resource basis, either via the CORS and regular expressions, or via the @cross_origin() decorator.

The application-wide configuration options are creatively prefixed with ‘CORS_’ e.g.

  • CORS_ORIGINS
  • CORS_METHODS
  • CORS_HEADERS
  • CORS_EXPOSE_HEADERS
  • CORS_ALWAYS_SEND
  • CORS_MAX_AGE
  • CORS_SEND_WILDCARD
  • CORS_ALWAYS_SEND

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

Tests

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.

Contributing

Questions, comments or improvements? Please create an issue on Github, tweet at @wcdolphin or send me an email.

Credits

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

 
File Type Py Version Uploaded on Size
Flask-Cors-1.7.2.tar.gz (md5) Source 2014-08-11 13KB
Flask_Cors-1.7.2-py2-none-any.whl (md5) Python Wheel 2.6 2014-08-11 9KB
Flask_Cors-1.7.2-py3-none-any.whl (md5) Python Wheel 3.3 2014-08-11 9KB
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