受 anubis 启发，今天想出了个怪点子：用纯 css 来反 bot，无需 JS！
思路是用 css 的动画，让浏览器在 3s 内按某种顺序请求几个 1x1 gif。
服务端如果发现这几个 gif 的请求顺序符合预期，则放行后续请求。
第 4s 时一样用 css 动画来隐藏占位图，并请求一张图，服务端根据是否放行，返回开心脸或哭脸图。
第 6s 时 html http-equiv="refresh" 自动刷新。
还别说，实际效果感觉行！
防下简单的非 headless 的 AI bot 应该还是很轻松的。
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Yes! Voice calls are currently available to users around the world.
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