Symfony EventSubscriber:页面重定向不正确

use Symfony\Component\EventDispatcher\EventSubscriberInterface;
use Symfony\Component\HttpFoundation\RedirectResponse;
use Symfony\Component\HttpKernel\Event\ResponseEvent;
use Symfony\Component\HttpKernel\KernelEvents;

class RedirectSubscriber implements EventSubscriberInterface
{
    public function onKernelResponse(ResponseEvent $event)
    {
        $response = $event->getResponse();
        $request = $event->getRequest();

        // 判断是否需要重定向
        if ($response->getStatusCode() === 301 && $request->getPathInfo() === '/old-url') {
            $newUrl = '/new-url';
            $event->setResponse(new RedirectResponse($newUrl));
        }
    }

    public static function getSubscribedEvents()
    {
        return [
            KernelEvents::RESPONSE => 'onKernelResponse',
        ];
    }
}

services:
    App\EventSubscriber\RedirectSubscriber:
        tags:
            - { name: kernel.event_subscriber }