From ee8e173193182a94310bb8cdb067cc5cc4ec4d19 Mon Sep 17 00:00:00 2001
From: QWp6t <hi@qwp6t.me>
Date: Sun, 26 Mar 2017 14:21:46 -0700
Subject: [PATCH] [jquery-cdn] Prefetch code.jquery.com

---
 modules/jquery-cdn.php | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/modules/jquery-cdn.php b/modules/jquery-cdn.php
index dcc24061..ef025365 100644
--- a/modules/jquery-cdn.php
+++ b/modules/jquery-cdn.php
@@ -21,6 +21,13 @@ function register_jquery() {
     true
   );
 
+  add_filter('wp_resource_hints', function ($urls, $relation_type) {
+    if ($relation_type === 'dns-prefetch') {
+      $urls[] = 'code.jquery.com';
+    }
+    return $urls;
+  }, 10, 2);
+
   add_filter('script_loader_src', __NAMESPACE__ . '\\jquery_local_fallback', 10, 2);
 }
 add_action('wp_enqueue_scripts', __NAMESPACE__ . '\\register_jquery', 100);