from http.server import HTTPServer, BaseHTTPRequestHandler
class Handler(BaseHTTPRequestHandler):
 def do_GET(self):
  self.send_response(401); self.send_header('WWW-Authenticate','Basic realm="Synthetic private dependency"'); self.end_headers(); self.wfile.write(b'Authentication required\n')
 def log_message(self,*args): print('HTTP request -> 401',flush=True)
HTTPServer(('127.0.0.1',19841),Handler).serve_forever()