Essence\Provider\MetaTags::_extract PHP Method

    protected function _extract($url, array $options)
    {
        $html = $this->_Http->get($url);
        $metas = $this->_extractMetas($html);
        if (empty($metas)) {
            throw new Exception("Unable to extract meta tags from '{$url}'.");
        }
        return $this->_media($metas);
    }