Check if the NO_AUTO_CACHE_CONTROL_HEADER exists

Author: abluchet

src/HttpCache/EventListener/AddHeadersListener.php

@@ -74,6 +74,8 @@ public function onKernelResponse(FilterResponseEvent $event)
             $this->public ? $response->setPublic() : $response->setPrivate();
         }
 
-        $response->headers->set(SessionListener::NO_AUTO_CACHE_CONTROL_HEADER, '');
+        if (defined(SessionListener::class.'::NO_AUTO_CACHE_CONTROL_HEADER')) {
+            $response->headers->set(SessionListener::NO_AUTO_CACHE_CONTROL_HEADER, '');
+        }
     }
 }

src/HttpCache/EventListener/AddTagsListener.php

@@ -67,7 +67,10 @@ public function onKernelResponse(FilterResponseEvent $event)
             return;
         }
 
-        $event->getResponse()->headers->set('Cache-Tags', implode(',', $resources));
-        $event->getResponse()->headers->set(SessionListener::NO_AUTO_CACHE_CONTROL_HEADER, '');
+        $response->headers->set('Cache-Tags', implode(',', $resources));
+
+        if (defined(SessionListener::class.'::NO_AUTO_CACHE_CONTROL_HEADER')) {
+            $response->headers->set(SessionListener::NO_AUTO_CACHE_CONTROL_HEADER, '');
+        }
     }
 }