diff --git a/libraries/controllers/server/ServerVariablesController.php b/libraries/controllers/server/ServerVariablesController.php
index 60dbd7a110..573bfa671a 100644
--- a/libraries/controllers/server/ServerVariablesController.php
+++ b/libraries/controllers/server/ServerVariablesController.php
@@ -11,6 +11,7 @@ namespace PMA\libraries\controllers\server;
 
 use PMA\libraries\controllers\Controller;
 use PMA\libraries\Message;
+use PMA\libraries\Response;
 use PMA\libraries\Template;
 use PMA\libraries\Util;
 use PMA\libraries\URL;
@@ -44,7 +45,8 @@ class ServerVariablesController extends Controller
      */
     public function indexAction()
     {
-        if (! empty($_REQUEST['ajax_request'])
+        $request = Request::getInstance();
+        if ($request->isAjax()
             && isset($_REQUEST['type'])
             && $_REQUEST['type'] === 'getval'
         ) {
@@ -52,7 +54,7 @@ class ServerVariablesController extends Controller
             return;
         }
 
-        if (! empty($_REQUEST['ajax_request'])
+        if ($request->isAjax()
             && isset($_REQUEST['type'])
             && $_REQUEST['type'] === 'setval'
         ) {
diff --git a/libraries/controllers/table/TableChartController.php b/libraries/controllers/table/TableChartController.php
index dca9b46990..4883b7d580 100644
--- a/libraries/controllers/table/TableChartController.php
+++ b/libraries/controllers/table/TableChartController.php
@@ -11,6 +11,7 @@ namespace PMA\libraries\controllers\table;
 
 use PMA\libraries\controllers\TableController;
 use PMA\libraries\Message;
+use PMA\libraries\Response;
 use PMA\libraries\Template;
 use PMA\libraries\Util;
 
@@ -61,7 +62,8 @@ class TableChartController extends TableController
      */
     public function indexAction()
     {
-        if (isset($_REQUEST['ajax_request'])
+        $request = Request::getInstance();
+        if ($request->isAjax()
             && isset($_REQUEST['pos'])
             && isset($_REQUEST['session_max_rows'])
         ) {
diff --git a/server_status_monitor.php b/server_status_monitor.php
index f6b93c4bac..ec676d17c5 100644
--- a/server_status_monitor.php
+++ b/server_status_monitor.php
@@ -20,7 +20,7 @@ $response = Response::getInstance();
 /**
  * Ajax request
  */
-if (isset($_REQUEST['ajax_request']) && $_REQUEST['ajax_request'] == true) {
+if ($response->isAjax()) {
     // Send with correct charset
     header('Content-Type: text/html; charset=UTF-8');
 
diff --git a/tbl_operations.php b/tbl_operations.php
index 1ce6ec4c19..ebd327d998 100644
--- a/tbl_operations.php
+++ b/tbl_operations.php
@@ -201,9 +201,7 @@ if (isset($result) && empty($message_to_show)) {
                 : PMA\libraries\Message::error();
         }
 
-        if (isset($GLOBALS['ajax_request'])
-            && $GLOBALS['ajax_request'] == true
-        ) {
+        if ($response->isAjax()) {
             $response->setRequestStatus($_message->isSuccess());
             $response->addJSON('message', $_message);
             if (!empty($sql_query)) {
@@ -223,9 +221,7 @@ if (isset($result) && empty($message_to_show)) {
         $_message = new PMA\libraries\Message;
         $_message->addMessagesString($warning_messages);
         $_message->isError(true);
-        if (isset($GLOBALS['ajax_request'])
-            && $GLOBALS['ajax_request'] == true
-        ) {
+        if ($response->isAjax()) {
             $response->setRequestStatus(false);
             $response->addJSON('message', $_message);
             if (!empty($sql_query)) {