cloudflare缓存与绕过缓存 | 雪饼的狗窝
https://zhouxuebin.club/blog/posts/cloudflare-bypass-cache/7fd52515/
Discussion
Range header is ignore on large files - General - Cloudflare Community
https://community.cloudflare.com/t/range-header-is-ignore-on-large-files/650787