Cloudflare R2对象存储桶，绑定域名为博客图片外链安全性规则，安全自定义规则，图片防盗链表达式规则。
(
http.request.uri.path contains ".jpg"
or http.request.uri.path contains ".jpeg"
or http.request.uri.path contains ".png"
or http.request.uri.path contains ".webp"
or http.request.uri.path contains ".gif"
)
and
http.referer ne ""
and
not http.referer contains "zairun.com"