def check_empty_response(self, orig_request, method_config, start_response):
response_config = method_config.get('<STR_LIT>', {}).get('<STR_LIT:body>')<EOL>if response_config == '<STR_LIT>':<EOL><INDENT>cors_handler = self._create_cors_handler(orig_request)<EOL>return util.send_wsgi_no_content_response(start_response, cors_handler)<EOL><DEDENT>
If the response from the backend is empty, return a HTTP 204 No Content.

        Args:
          orig_request: An ApiRequest, the original request from the user.
          method_config: A dict, the API config of the method to be called.
          start_response: A function with semantics defined in PEP-333.

        Returns:
          If the backend response was empty, this returns a string containing the
          response body that should be returned to the user.  If the backend
          response wasn't empty, this returns None, indicating that we should not
          exit early with a 204.