public function publish_http_response($channel, $http_response, $id = null, $prev_id = null)
    {
        if (is_string($http_response)) {
            $http_response = new HttpResponseFormat(null, null, null, $http_response);
        }
        $item = new \PubControl\Item($http_response, $id, $prev_id);
        parent::publish($channel, $item);
    }