Piwik\Tracker\VisitExcluded::isPrefetchDetected PHP Method

    protected function isPrefetchDetected()
    {
        return isset($_SERVER["HTTP_X_PURPOSE"]) && in_array($_SERVER["HTTP_X_PURPOSE"], array("preview", "instant")) || isset($_SERVER['HTTP_X_MOZ']) && $_SERVER['HTTP_X_MOZ'] == "prefetch";
    }