在Symfony PHP中重定向来自事件订阅服务器的响应

我的订户如下:

use Symfony\Component\EventDispatcher\EventSubscriberInterface;
use Symfony\Component\HttpKernel\Event\GetResponseEvent;
use Symfony\Component\HttpKernel\KernelEvents;

use Symfony\Component\HttpFoundation\RedirectResponse;

class KernelSubscriber implements EventSubscriberInterface {

    public function __construct() {

        // some stuff here but not relevant for this example
    }

    public static function getSubscribedEvents(): array {

        return [ KernelEvents::REQUEST => 'onRequest' ];
    }

    public function onRequest(GetResponseEvent $event): void {

        // if conditions met
        //     301 redirect to some internal or external URL

        if(!$event->isMasterRequest()) return;
    }   
}

如果这是一个控制器,我会返回 $this->redirectToRoute('route') 或者类似的,但是从 onRequest

如何从该事件订阅服务器返回响应(特别是重定向)?