code: def auth_request_handler(self, callback):
          
          warnings.warn("This handler is deprecated. The recommended approach to have control over "
                        "the authentication resource is to disable the built-in  resource by "
                        "setting JWT_AUTH_URL_RULE=None and registering your own authentication "
                        "resource directly on your application.", DeprecationWarning, stacklevel=2)
          self.auth_request_callback = callback
          return callback
docs: Specifies the authentication response handler function.
  
          :param callable callback: the auth request handler function
  
          .. deprecated