public function redirect(string $url = '', int $statusCode = 302)
    {
        $this->is404 = false;
        $server = filter_input_array(INPUT_SERVER);
        if ('' == $url && isset($server['REQUEST_URI'])) {
            $url = '/' . trim($server['REQUEST_URI'], '/');
            preg_match('/^[\\a-zA-Z0-9-\._~:\/\?\#\[\]\@\!\$\&\'\(\)\*\+\,\;\=%]*$/iD', $url, $match);
            $url = $match[1] ?? '';
        }

        if (!headers_sent()) {
            header('Location: ' . $url, true, $statusCode);
        }

        echo sprintf('<!DOCTYPE html>
<html>
    <head>
        <meta charset="UTF-8" />
        <meta http-equiv="refresh" content="0;url=%1$s" />
        <title>Redirecting to %1$s</title>
    </head>
    <body>
        <script type="text/javascript"> window.location.href = "%1$s"; </script>
        Redirecting to <a href="%1$s">%1$s</a>.
    </body>
</html>', htmlspecialchars($url, ENT_QUOTES, 'UTF-8'));

    }