comparison vendor/symfony/http-kernel/HttpCache/ResponseCacheStrategy.php @ 12:7a779792577d

Update Drupal core to v8.4.5 (via Composer)

     /**
      * {@inheritdoc}
      */
     public function add(Response $response)
     {
-        if ($response->isValidateable()) {
+        if (!$response->isFresh() || !$response->isCacheable()) {
             $this->cacheable = false;
         } else {
             $maxAge = $response->getMaxAge();
             $this->ttls[] = $response->getTtl();
             $this->maxAges[] = $maxAge;

         // their own cache, because some of the response content comes from
         // at least one embedded response (which likely has a different caching strategy).
         if ($response->isValidateable()) {
             $response->setEtag(null);
             $response->setLastModified(null);
+        }
+
+        if (!$response->isFresh()) {
             $this->cacheable = false;
         }
 
         if (!$this->cacheable) {
             $response->headers->set('Cache-Control', 'no-cache, must-revalidate');