from http.server import ThreadingHTTPServer, BaseHTTPRequestHandler
import time
class Handler(BaseHTTPRequestHandler):
 def do_GET(self):
  print('REQUEST_STARTED', flush=True)
  time.sleep(240)
  try:
   self.send_response(200); self.end_headers(); self.wfile.write(b'DONE')
  except BrokenPipeError: pass
ThreadingHTTPServer(('127.0.0.1', 18907), Handler).serve_forever()