Frontend\Core\Engine\Header::setCanonicalUrl PHP Method

    public function setCanonicalUrl($url)
    {
        $url = (string) $url;
        // convert relative url
        if (mb_substr($url, 0, 1) == '/') {
            $url = SITE_URL . $url;
        }
        // store
        $this->canonical = $url;
    }