#!/usr/bin/env python

# https://gist.github.com/ccoenen/8038234
# https://gist.github.com/dustingetz/5348582

import http.server # python3
# import SimpleHTTPServer # python2

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)

#!/usr/bin/env python

# https://gist.github.com/ccoenen/8038234
# https://gist.github.com/dustingetz/5348582

import http.server # python3
# import SimpleHTTPServer # python2

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")

MyHTTPRequestHandler.extensions_map['.cjs'] = 'application/x-javascript'

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

add .cjs mime mapping to dev-http-server.py