CustomPageExceptionHtmlSubscriber::makeSubrequestToCustomPath

protected CustomPageExceptionHtmlSubscriber::makeSubrequestToCustomPath(GetResponseForExceptionEvent $event, $custom_path, $status_code)

protected function makeSubrequestToCustomPath(GetResponseForExceptionEvent $event, $custom_path, $status_code) {
  $url = Url::fromUserInput($custom_path);
  if ($url->isRouted()) {
    $access_result = $this->accessManager->checkNamedRoute($url->getRouteName(), $url->getRouteParameters(), NULL, TRUE);
    $request = $event->getRequest();

    // Merge the custom path's route's access result's cacheability metadata
    // with the existing one (from the master request), otherwise create it.
    if (!$request->attributes->has(AccessAwareRouterInterface::ACCESS_RESULT)) {
      $request->attributes->set(AccessAwareRouterInterface::ACCESS_RESULT, $access_result);
    }
    else {
      $existing_access_result = $request->attributes->get(AccessAwareRouterInterface::ACCESS_RESULT);
      if ($existing_access_result instanceof RefinableCacheableDependencyInterface) {
        $existing_access_result->addCacheableDependency($access_result);
      }
    }

    // Only perform the subrequest if the custom path is actually accessible.
    if (!$access_result->isAllowed()) {
      return;
    }
  }

  $this->makeSubrequest($event, $custom_path, $status_code);
}