diff --git a/core/lib/Drupal/Core/StackMiddleware/ReverseProxyMiddleware.php b/core/lib/Drupal/Core/StackMiddleware/ReverseProxyMiddleware.php
index 8ef248e..3d7c1f5 100644
--- a/core/lib/Drupal/Core/StackMiddleware/ReverseProxyMiddleware.php
+++ b/core/lib/Drupal/Core/StackMiddleware/ReverseProxyMiddleware.php
@@ -65,6 +65,7 @@ public function handle(Request $request, $type = self::MASTER_REQUEST, $catch =
       $response->headers->remove('X-Drupal-Cache-Tags');
       $response->headers->remove('X-Drupal-Cache-Contexts');
     }
+    return $response;
   }
 
 }