Python SimpleHTTPRequestHandler set Access-Control-Allow-Origin header

server.py

'''
@jimmyromanticde

Note:
python 2.x Only

Problem:
Error browser log 
XMLHttpRequest cannot load http://127.0.0.1:8000/visitor.json. No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'null' is therefore not allowed access.
'''

import os
import sys
import SocketServer
from SimpleHTTPServer import SimpleHTTPRequestHandler

PORT = 8000

class HTTPRequestHandler(SimpleHTTPRequestHandler):
    def end_headers(self):
        self.send_header('Access-Control-Allow-Origin', '*')
        SimpleHTTPRequestHandler.end_headers(self)

def server(port):
    httpd = SocketServer.TCPServer(('', port), HTTPRequestHandler)
    return httpd

if __name__ == "__main__":
    port = PORT
    httpd = server(port)
    try:
        print "\nserving from localhost:" + str(port)
        httpd.serve_forever()
    except KeyboardInterrupt:
        print "\n...shutting down http server"
        httpd.shutdown()
        sys.exit()