public function byPassCache(EventInterface $event)/*# : bool */
    {
        /* @var CachePool $pool */
        $pool = $event->getTarget();

        if ($this->trigger === '' || isset($_REQUEST[$this->trigger])) {
            return $pool->setError(
                Message::get(Message::CACHE_EXT_BYPASS),
                Message::CACHE_EXT_BYPASS
            );
        } else {
            return true;
        }
    }