[1] Using Page Rules to Re-Write Host Headers – Cloudflare Support () https://support.cloudflare.com/hc/en-us/articles/206652947-Using-Page-Rules-to-Re-Write-Host-Headers
[2] Cloudflare は LWP からのアクセスを 403 で弾いているようです。
[3] CloudFlare死んでね? () https://hayabusa.open2ch.net/test/read.cgi/livejupiter/1613012037/