only in patch2:
unchanged:
--- a/core/includes/common.inc
+++ b/core/includes/common.inc
@@ -2268,8 +2268,8 @@ function drupal_clear_js_cache() {
  */
 function drupal_page_set_cache(Response $response, Request $request) {
   // Check if the current page may be compressed.
-  if (\Drupal::config('system.performance')->get('response.gzip') &&
-    !$response->headers->get('Content-Encoding') && extension_loaded('zlib')) {
+  if (extension_loaded('zlib') && !$response->headers->get('Content-Encoding') &&
+      \Drupal::config('system.performance')->get('response.gzip')) {
 
     $content = $response->getContent();
     if ($content) {