serve.py

#!/usr/bin/env python3

from http.server import HTTPServer, SimpleHTTPRequestHandler, test
import sys


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


if __name__ == '__main__':
    test(
        CORSRequestHandler,
        HTTPServer,
        port=int(sys.argv[1]) if len(sys.argv) > 1 else 8000
    )