code: def _handle_api(self, handler, handler_args, handler_kwargs):
          
          try:
              status_code, return_value = handler(*handler_args, **handler_kwargs)
          except APIError as error:
              return error.send()
  
          web.ctx.status = _convert_http_status(status_code)
          return _api_convert_output(return_value)
docs: Handle call to subclasses and convert the output to an appropriate value