Nextras\MailPanel\MailPanel::returnBack PHP Метод

    private function returnBack()
    {
        $currentUrl = $this->request->getUrl();
        $refererUrl = $this->request->getReferer();
        if ($refererUrl === NULL) {
            throw new \RuntimeException('Unable to redirect back because your browser did not send referrer');
        } elseif ($refererUrl->isEqual($currentUrl)) {
            throw new \RuntimeException('Unable to redirect back because it would create loop');
        }
        header('Location: ' . $refererUrl);
        exit;
    }