httpd.py

import sys

from http.server import HTTPServer, SimpleHTTPRequestHandler

class CORSRequestHandler(SimpleHTTPRequestHandler):
    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs, directory='html')

    def end_headers(self):
        self.send_header('Access-Control-Allow-Origin', '*')
        self.send_header('Cross-Origin-Embedder-Policy', 'require-corp')
        self.send_header('Access-Control-Allow-Methods', '*')
        self.send_header('Access-Control-Allow-Headers', '*')
        self.send_header('Cross-Origin-Opener-Policy', 'same-origin')
        # self.send_header('Cache-Control', 'max-age=3600, must-revalidate')
        self.send_header('Cache-Control', 'no-store, no-cache, must-revalidate')

        return super(CORSRequestHandler, self).end_headers()

    def do_OPTIONS(self):
        self.send_response(200)
        self.end_headers()

host = '0.0.0.0'
port = 9876

print("Listening on {}:{}".format(host, port))
httpd = HTTPServer((host, port), CORSRequestHandler)
httpd.serve_forever()