Python 3: serve the current directory as HTTP while setting CORS headers for XHR debugging

simple_cors_server.py

#!/usr/bin/env python3
# encoding: utf-8
"""Use instead of `python3 -m http.server` when you need CORS"""

import sys
from http.server import HTTPServer, SimpleHTTPRequestHandler

class CORSRequestHandler(SimpleHTTPRequestHandler):
    def end_headers(self):
        self.send_header('Access-Control-Allow-Origin', '*')
        self.send_header('Access-Control-Allow-Methods', 'GET, OPTIONS')
        self.send_header('Cache-Control', 'no-store, no-cache, must-revalidate')
        return super(CORSRequestHandler, self).end_headers()
    
    def do_OPTIONS(self):
        self.send_header('Access-Control-Allow-Origin', '*')
        self.send_header('Access-Control-Allow-Methods', 'GET, OPTIONS')
        self.send_header('Cache-Control', 'no-store, no-cache, must-revalidate')
        return super(CORSRequestHandler, self).end_headers()

port = int(sys.argv[1]) if len(sys.argv) > 0 and sys.argv[1] else 8080
print(f'starting server on port {port}')
httpd = HTTPServer(('localhost', port), CORSRequestHandler)
httpd.serve_forever()