https://github.com/corydolphin/flask-cors/blob/master/examples/app_based_example.py

"""
  Flask-Cors example
  ===================
  This is a tiny Flask Application demonstrating Flask-Cors, making it simple
  to add cross origin support to your flask app!
   
  :copyright: (C) 2013 by Cory Dolphin.
  :license: MIT/X11, see LICENSE for more details.
  """
  from flask import Flask, jsonify
  import logging
  try:
  from flask.ext.cors import CORS # The typical way to import flask-cors
  except ImportError:
  # Path hack allows examples to be run without installation.
  import os
  parentdir = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
  os.sys.path.insert(0, parentdir)
   
  from flask.ext.cors import CORS
   
   
  app = Flask('FlaskCorsAppBasedExample')
  logging.basicConfig(level=logging.INFO)
   
  # To enable logging for flask-cors,
  logging.getLogger('flask_cors').level = logging.DEBUG
   
  # One of the simplest configurations. Exposes all resources matching /api/* to
  # CORS and allows the Content-Type header, which is necessary to POST JSON
  # cross origin.
  CORS(app, resources=r'/api/*', allow_headers='Content-Type')
   
   
  @app.route("/")
  def helloWorld():
  '''
  Since the path '/' does not match the regular expression r'/api/*',
  this route does not have CORS headers set.
  '''
  return '''
  <html>
  <h1>Hello CORS!</h1>
  <h3> End to end editable example with jquery! </h3>
  <a class="jsbin-embed" href="http://jsbin.com/zazitas/embed?js,console">JS Bin on jsbin.com</a>
  <script src="//static.jsbin.com/js/embed.min.js?3.35.12"></script>
   
  </html>
  '''
   
  @app.route("/api/v1/users/")
  def list_users():
  '''
  Since the path matches the regular expression r'/api/*', this resource
  automatically has CORS headers set. The expected result is as follows:
   
  $ curl --include -X GET http://127.0.0.1:5000/api/v1/users/ \
  --header Origin:www.examplesite.com
  HTTP/1.0 200 OK
  Access-Control-Allow-Headers: Content-Type
  Access-Control-Allow-Origin: *
  Content-Length: 21
  Content-Type: application/json
  Date: Sat, 09 Aug 2014 00:26:41 GMT
  Server: Werkzeug/0.9.4 Python/2.7.8
   
  {
  "success": true
  }
   
  '''
  return jsonify(user="joe")
   
   
  @app.route("/api/v1/users/create", methods=['POST'])
  def create_user():
  '''
  Since the path matches the regular expression r'/api/*', this resource
  automatically has CORS headers set.
   
  Browsers will first make a preflight request to verify that the resource
  allows cross-origin POSTs with a JSON Content-Type, which can be simulated
  as:
  $ curl --include -X OPTIONS http://127.0.0.1:5000/api/v1/users/create \
  --header Access-Control-Request-Method:POST \
  --header Access-Control-Request-Headers:Content-Type \
  --header Origin:www.examplesite.com
  >> HTTP/1.0 200 OK
  Content-Type: text/html; charset=utf-8
  Allow: POST, OPTIONS
  Access-Control-Allow-Origin: *
  Access-Control-Allow-Headers: Content-Type
  Access-Control-Allow-Methods: DELETE, GET, HEAD, OPTIONS, PATCH, POST, PUT
  Content-Length: 0
  Server: Werkzeug/0.9.6 Python/2.7.9
  Date: Sat, 31 Jan 2015 22:25:22 GMT
   
   
  $ curl --include -X POST http://127.0.0.1:5000/api/v1/users/create \
  --header Content-Type:application/json \
  --header Origin:www.examplesite.com
   
   
  >> HTTP/1.0 200 OK
  Content-Type: application/json
  Content-Length: 21
  Access-Control-Allow-Origin: *
  Server: Werkzeug/0.9.6 Python/2.7.9
  Date: Sat, 31 Jan 2015 22:25:04 GMT
   
  {
  "success": true
  }
   
  '''
  return jsonify(success=True)
   
   
  if __name__ == "__main__":
  app.run(debug=True)

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