Contao\CoreBundle\EventListener\StoreRefererListener::canModifyBackendSession PHP Метод

    private function canModifyBackendSession(Request $request)
    {
        return !$request->query->has('act') && !$request->query->has('key') && !$request->query->has('token') && !$request->query->has('state') && 'feRedirect' !== $request->query->get('do') && 'contao_backend' === $request->attributes->get('_route') && !$request->isXmlHttpRequest();
    }