font-awesome from bytecdn

_data/variables.yml

@@ -43,7 +43,8 @@ default:
 
 sources:
   bootcdn:
-    font_awesome: 'https://cdn.bootcdn.net/ajax/libs/font-awesome/5.15.1/css/all.min.css'
+    font_awesome: 'https://lf9-cdn-tos.bytecdntp.com/cdn/expire-1-M/font-awesome/5.15.1/css/all.min.css'
+    # https://cdn.bytedance.com/?query=font-awesome&version=5.15.1
     jquery: 'https://cdn.bootcss.com/jquery/3.1.1/jquery.min.js'
     leancloud_js_sdk: '//cdn.jsdelivr.net/npm/[email protected]/dist/av-min.js'
     chart: 'https://cdn.bootcss.com/Chart.js/2.7.2/Chart.bundle.min.js'