getSurrogate example

    public function onKernelResponse(ResponseEvent $event): void
    {
        if (!$event->isMainRequest()) {
            return;
        }

        $kernel = $event->getKernel();
        $surrogate = $this->surrogate;
        if ($kernel instanceof HttpCache) {
            $surrogate = $kernel->getSurrogate();
            if (null !== $this->surrogate && $this->surrogate->getName() !== $surrogate->getName()) {
                $surrogate = $this->surrogate;
            }
        }

        if (null === $surrogate) {
            return;
        }

        $surrogate->addSurrogateControl($event->getResponse());
    }

    

    public function onKernelResponse(ResponseEvent $event): void
    {
        if (!$event->isMainRequest()) {
            return;
        }

        $kernel = $event->getKernel();
        $surrogate = $this->surrogate;
        if ($kernel instanceof HttpCache) {
            $surrogate = $kernel->getSurrogate();
            if (null !== $this->surrogate && $this->surrogate->getName() !== $surrogate->getName()) {
                $surrogate = $this->surrogate;
            }
        }

        if (null === $surrogate) {
            return;
        }

        $surrogate->addSurrogateControl($event->getResponse());
    }