code: def __response_message_descriptor(self, message_type, method_id):
      
  
      # Skeleton response descriptor, common to all response objects
      descriptor = {'200': {'description': 'A successful response'}}
  
      if message_type != message_types.VoidMessage():
        self.__parser.add_message(message_type.__class__)
        self.__response_schema[method_id] = self.__parser.ref_for_message_type(
            message_type.__class__)
        descriptor['200']['schema'] = {'$ref': '#/definitions/{0}'.format(
            self.__response_schema[method_id])}
  
      return dict(descriptor)
docs: Describes the response.
  
      Args:
        message_type: messages.Message class, The message to describe.
        method_id: string, Unique method identifier (e.g. 'myapi.items.method')
  
      Returns:
        Dictionary describing the response.