public function getDefaultUrl(): string
    {
        $connection = GeneralUtility::makeInstance(ConnectionPool::class)->getConnectionForTable('pages');
        $firstPageInTree = $connection->select(['uid'], 'pages', ['pid' => 0], [], ['sorting' => 'ASC'], 1)->fetchColumn(0);
        $url = BackendUtility::getViewDomain($firstPageInTree);

        return $url;
    }