diff --git a/core/lib/Drupal/Core/EventSubscriber/FinishResponseSubscriber.php b/core/lib/Drupal/Core/EventSubscriber/FinishResponseSubscriber.php
index 251b920..c22107f 100644
--- a/core/lib/Drupal/Core/EventSubscriber/FinishResponseSubscriber.php
+++ b/core/lib/Drupal/Core/EventSubscriber/FinishResponseSubscriber.php
@@ -117,7 +117,7 @@ public function onRespond(FilterResponseEvent $event) {
 
     // Expose the cache contexts and cache tags associated with this page in a
     // X-Drupal-Cache-Contexts and X-Drupal-Cache-Tags header respectively.
-    if ($response instanceof CacheableResponseInterface) {
+    if (Settings::get('reverse_proxy', FALSE) && $response instanceof CacheableResponseInterface) {
       $response_cacheability = $response->getCacheableMetadata();
       $response->headers->set('X-Drupal-Cache-Tags', implode(' ', $response_cacheability->getCacheTags()));
       $response->headers->set('X-Drupal-Cache-Contexts', implode(' ', $this->cacheContextsManager->optimizeTokens($response_cacheability->getCacheContexts())));