diff -r 3d4e9c994f10 -r a86126ab1dd4 wp/wp-admin/admin-ajax.php
--- a/wp/wp-admin/admin-ajax.php	Tue Oct 22 16:11:46 2019 +0200
+++ b/wp/wp-admin/admin-ajax.php	Tue Dec 15 13:49:49 2020 +0100
@@ -19,24 +19,24 @@
 }
 
 /** Load WordPress Bootstrap */
-require_once( dirname( dirname( __FILE__ ) ) . '/wp-load.php' );
+require_once dirname( __DIR__ ) . '/wp-load.php';
 
 /** Allow for cross-domain requests (from the front end). */
 send_origin_headers();
 
-// Require an action parameter
+header( 'Content-Type: text/html; charset=' . get_option( 'blog_charset' ) );
+header( 'X-Robots-Tag: noindex' );
+
+// Require an action parameter.
 if ( empty( $_REQUEST['action'] ) ) {
 	wp_die( '0', 400 );
 }
 
 /** Load WordPress Administration APIs */
-require_once( ABSPATH . 'wp-admin/includes/admin.php' );
+require_once ABSPATH . 'wp-admin/includes/admin.php';
 
 /** Load Ajax Handlers for WordPress Core */
-require_once( ABSPATH . 'wp-admin/includes/ajax-actions.php' );
-
-@header( 'Content-Type: text/html; charset=' . get_option( 'blog_charset' ) );
-@header( 'X-Robots-Tag: noindex' );
+require_once ABSPATH . 'wp-admin/includes/ajax-actions.php';
 
 send_nosniff_header();
 nocache_headers();
@@ -53,6 +53,7 @@
 	'autocomplete-user',
 	'dashboard-widgets',
 	'logged-in',
+	'rest-nonce',
 );
 
 $core_actions_post = array(
@@ -105,6 +106,7 @@
 	'send-link-to-editor',
 	'send-attachment-to-editor',
 	'save-attachment-order',
+	'media-create-image-subsizes',
 	'heartbeat',
 	'get-revision-diffs',
 	'save-user-color-scheme',
@@ -137,18 +139,19 @@
 	'health-check-background-updates',
 	'health-check-loopback-requests',
 	'health-check-get-sizes',
+	'toggle-auto-updates',
 );
 
-// Deprecated
+// Deprecated.
 $core_actions_post_deprecated = array( 'wp-fullscreen-save-post', 'press-this-save-post', 'press-this-add-category' );
 $core_actions_post            = array_merge( $core_actions_post, $core_actions_post_deprecated );
 
 // Register core Ajax calls.
-if ( ! empty( $_GET['action'] ) && in_array( $_GET['action'], $core_actions_get ) ) {
+if ( ! empty( $_GET['action'] ) && in_array( $_GET['action'], $core_actions_get, true ) ) {
 	add_action( 'wp_ajax_' . $_GET['action'], 'wp_ajax_' . str_replace( '-', '_', $_GET['action'] ), 1 );
 }
 
-if ( ! empty( $_POST['action'] ) && in_array( $_POST['action'], $core_actions_post ) ) {
+if ( ! empty( $_POST['action'] ) && in_array( $_POST['action'], $core_actions_post, true ) ) {
 	add_action( 'wp_ajax_' . $_POST['action'], 'wp_ajax_' . str_replace( '-', '_', $_POST['action'] ), 1 );
 }
 
@@ -187,5 +190,5 @@
 	 */
 	do_action( "wp_ajax_nopriv_{$action}" );
 }
-// Default status
+// Default status.
 wp_die( '0' );