public DynamicPageCacheSubscriber::onResponse(FilterResponseEvent $event)
Stores a response in case of a Dynamic Page Cache miss, if cacheable.
Parameters
\Symfony\Component\HttpKernel\Event\FilterResponseEvent $event: The event to process.
File
- core/modules/dynamic_page_cache/src/EventSubscriber/DynamicPageCacheSubscriber.php, line 151
Class
- DynamicPageCacheSubscriber
- Returns cached responses as early and avoiding as much work as possible.
Namespace
Drupal\dynamic_page_cache\EventSubscriber
Code
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 | public function onResponse(FilterResponseEvent $event) { $response = $event->getResponse(); // Dynamic Page Cache only works with cacheable responses. It does not work // with plain Response objects. (Dynamic Page Cache needs to be able to // access and modify the cacheability metadata associated with the // response.) if (!$response instanceof CacheableResponseInterface) { return; } // There's no work left to be done if this is a Dynamic Page Cache hit. if ($response->headers->get(self::HEADER) === 'HIT') { return; } // There's no work left to be done if this is an uncacheable response. if (!$this->shouldCacheResponse($response)) { // The response is uncacheable, mark it as such. $response->headers->set(self::HEADER, 'UNCACHEABLE'); return; } // Don't cache the response if Dynamic Page Cache's request subscriber did // not fire, because that means it is impossible to have a Dynamic Page // Cache hit. This can happen when the master request is for example a 403 // or 404, in which case a subrequest is performed by the router. In that // case, it is the subrequest's response that is cached by Dynamic Page // Cache, because the routing happens in a request subscriber earlier than // Dynamic Page Cache's and immediately sets a response, i.e. the one // returned by the subrequest, and thus causes Dynamic Page Cache's request // subscriber to not fire for the master request. // @see \Drupal\Core\Routing\AccessAwareRouter::checkAccess() // @see \Drupal\Core\EventSubscriber\DefaultExceptionHtmlSubscriber::on403() $request = $event->getRequest(); if (!isset($this->requestPolicyResults[$request])) { return; } // Don't cache the response if the Dynamic Page Cache request & response // policies are not met. // @see onRouteMatch() if ($this->requestPolicyResults[$request] === RequestPolicyInterface::DENY || $this->responsePolicy->check($response, $request) === ResponsePolicyInterface::DENY) { return; } // Embed the response object in a render array so that RenderCache is able // to cache it, handling cache redirection for us. $response_as_render_array = $this->responseToRenderArray($response); $this->renderCache->set($response_as_render_array, $this->dynamicPageCacheRedirectRenderArray); // The response was generated, mark the response as a cache miss. The next // time, it will be a cache hit. $response->headers->set(self::HEADER, 'MISS');} |
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