Symfony\Component\HttpKernel\EventListener\FragmentListener::validateRequest PHP Method

    protected function validateRequest(Request $request)
    {
        // is the Request safe?
        if (!$request->isMethodSafe(false)) {
            throw new AccessDeniedHttpException();
        }
        // is the Request signed?
        // we cannot use $request->getUri() here as we want to work with the original URI (no query string reordering)
        if ($this->signer->check($request->getSchemeAndHttpHost() . $request->getBaseUrl() . $request->getPathInfo() . (null !== ($qs = $request->server->get('QUERY_STRING')) ? '?' . $qs : ''))) {
            return;
        }
        throw new AccessDeniedHttpException();
    }