protected function _crawlUrl($url) {
        $client = Mage::helper('turpentine/cron')->getCrawlerClient();
        $client->setUri($url);
        Mage::helper('turpentine/debug')->logDebug('Crawling URL: %s', $url);
        try {
            $response = $client->request();
        } catch (Exception $e) {
            Mage::helper('turpentine/debug')->logWarn(
                'Error crawling URL (%s): %s',
                $url, $e->getMessage() );
            return false;
        }
        return $response->isSuccessful();
    }