Preface

I was able to use CDN to accelerate access speed. Everything went smoothly after using CDN, until one day when I checked the CDN logs and found that the origin error rate had surged dramatically.

Analysis of the Cause

First, I accessed my own website and found that while the page could display, all styles and buttons were gone. When I opened the developer tools (F12), I saw many 403 errors. No wonder the origin error rate was so high.