diff --git a/core/includes/common.inc b/core/includes/common.inc
index 4668a90..af226b6 100644
--- a/core/includes/common.inc
+++ b/core/includes/common.inc
@@ -5428,7 +5428,9 @@ function show(&$element) {
  * @see drupal_render_cache_set()
  */
 function drupal_render_cache_get($elements) {
-  if (!in_array($_SERVER['REQUEST_METHOD'], array('GET', 'HEAD')) || !$cid = drupal_render_cid_create($elements)) {
+  $REQUEST_METHOD = Drupal::request()->server->get('REQUEST_METHOD');
+
+  if (!in_array($REQUEST_METHOD, array('GET', 'HEAD')) || !$cid = drupal_render_cid_create($elements)) {
     return FALSE;
   }
   $bin = isset($elements['#cache']['bin']) ? $elements['#cache']['bin'] : 'cache';
@@ -5459,8 +5461,10 @@ function drupal_render_cache_get($elements) {
  * @see drupal_render_cache_get()
  */
 function drupal_render_cache_set(&$markup, $elements) {
+  $REQUEST_METHOD = Drupal::request()->server->get('REQUEST_METHOD');
+
   // Create the cache ID for the element.
-  if (!in_array($_SERVER['REQUEST_METHOD'], array('GET', 'HEAD')) || !$cid = drupal_render_cid_create($elements)) {
+  if (!in_array($REQUEST_METHOD, array('GET', 'HEAD')) || !$cid = drupal_render_cid_create($elements)) {
     return FALSE;
   }