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A Flask extension adding a decorator for CORS support

Project description

Flask-CORS is a simple extension to Flask allowing you to support cross origin resource sharing (CORS) using a simple decorator.

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Install the extension with using pip, or easy_install.

$ pip install flask-cors


This extension 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.

Simple Usage

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

Using JSON with Cross Origin

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.

@app.route("/user/create", methods=['GET','POST'])
@cross_origin(headers=['Content-Type']) # Send Access-Control-Allow-Headers
def cross_origin_json_post():
  return jsonify(success=True)

Application-wide settings

Alternatively, setting your application’s CORS_ORIGINS configuration property will

app.config['CORS_ORIGINS'] = ['Foo', 'Bar']

@cross_origin() # will return CORS headers for origins 'Foo' and 'Bar'
def helloWorld():
  return "Hello, cross-origin-world!"

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


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


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

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Flask-Cors-1.3.1.tar.gz (10.0 kB view hashes)

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