code: def add(self, message, request):
          
          self._debug_log.debug('Logging new Response entry')
          response = Response(message, request)
          self._log_entries.appendleft(response)
          return response
docs: Add a new log entry
          :param message: The request message
          :type  message: str
  
          :param request: The Request associated with this response
          :type  request: Request or None
  
          :return: The logged Response instance
          :rtype : Response