Simple Tornado-based webserver for Python

server.py

#!/usr/bin/env python

import tornado.ioloop
import tornado.web
import threading
import time

LISTEN_PORT = 8000

class FancyStaticFileHandler(tornado.web.StaticFileHandler):
    def set_default_headers(self):
        # Allow other domains, prevent any caching
        self.set_header("Access-Control-Allow-Origin", "*")
        self.set_header('Cache-Control', 'no-store, no-cache, must-revalidate, max-age=0')

class WebServer():
    def __init__(self, port_number, www_root):
        self.port_number = port_number
        self.www_root = www_root

        # --- Tornado Server Startup ---
        self.application = tornado.web.Application([
            (r"/(.*)", FancyStaticFileHandler, {"path": self.www_root, "default_filename": "index.html"}),   # static
        ], autoreload=True)

    def stop(self):
        tornado.ioloop.IOLoop.instance().add_callback(self._shutdown)

    def run(self):
        self.application.listen(self.port_number)
        print("HTTP server listening on port " + str(self.port_number))
        tornado.ioloop.IOLoop.instance().start()        # blocks here

    def _shutdown(self):
        tornado.ioloop.IOLoop.instance().stop()


if __name__ == '__main__':
    server = WebServer(LISTEN_PORT, "www")

    t = threading.Thread(target=server.run)
    t.start()
    time.sleep(1)

    while True:
        try:
            input("Press Enter to quit.\n")
            break
        except KeyboardInterrupt:
            pass

    server.stop()
    print("Shutting down...")
    t.join()