code: def make_request_fn():
    
    if FLAGS.cloud_mlengine_model_name:
      request_fn = serving_utils.make_cloud_mlengine_request_fn(
          credentials=GoogleCredentials.get_application_default(),
          model_name=FLAGS.cloud_mlengine_model_name,
          version=FLAGS.cloud_mlengine_model_version)
    else:
  
      request_fn = serving_utils.make_grpc_request_fn(
          servable_name=FLAGS.servable_name,
          server=FLAGS.server,
          timeout_secs=FLAGS.timeout_secs)
    return request_fn
docs: Returns a request function.