serve.py

#!/usr/bin/env python
import http.server

class MyHTTPRequestHandler(http.server.SimpleHTTPRequestHandler):
    def end_headers(self):
        self.send_my_headers()
        http.server.SimpleHTTPRequestHandler.end_headers(self)

    def send_my_headers(self):
        self.send_header("Cache-Control", "no-cache, no-store, must-revalidate")
        self.send_header("Pragma", "no-cache")
        self.send_header("Expires", "0")


if __name__ == '__main__':
    http.server.test(HandlerClass=MyHTTPRequestHandler)

this fork is for those who wish to use python3. Otherwise it's identical to @dustingetz' original.