Falcon CORS ref: http://qiita.com/giwa/items/0385a6c90a1e712b00d7

file0.txt

import falcon

class CORSMiddleware:
    def process_request(self, req, resp):
        resp.set_header('Access-Control-Allow-Origin', '*')

class Todo:
    def on_get(self, req, resp):
        resp.status = falcon.HTTP_200
        resp.body = '{"foo":"bar"}'

api = application = falcon.API(middleware=[CORSMiddleware()])
todo = Todo()

api.add_route('/todo', todo)

file1.txt

HTTP/1.1 200 OK
Connection: close
Date: Fri, 27 May 2016 07:14:46 GMT
Server: gunicorn/19.6.0
access-control-allow-origin: *
content-length: 13
content-type: application/json; charset=UTF-8

{
    "foo": "bar"
}