Preface The free CDN solution provided by Cloudflare for individuals works well in places other than China. However, Cloudflare normally only accepts secondary domain names to be accessed in the form of NS, and the public IP address needs to be specified when setting up through DNS...

Preface Actually, from the title of the demand, it seems that it is not very meaningful now, because if you only use cloudflare, there are too many ways to quickly access domestic sites from abroad (tunnel, custom host). I considered this issue at the time because I wanted to solve the backup problem.