public function onKernelResponse(FilterResponseEvent $event)
    {
        if (HttpKernelInterface::MASTER_REQUEST != $event->getRequestType()) {
            return;
        }

        if (!in_array($event->getRequest()->get('_route'), $this->routes)) {
            return;
        }

        $response = $event->getResponse();
        $varyHeaders = $response->headers->get('vary', null, false);

        foreach ($this->userIdentifierHeaders as $removableVary) {
            unset($varyHeaders[array_search(strtolower($removableVary), $varyHeaders)]);
        }
        $response->setVary($varyHeaders, true);
    }