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

def add(self, message, request):
        """
        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
        """
        self._debug_log.debug('Logging new Response entry')
        response = Response(message, request)
        self._log_entries.appendleft(response)
        return response