浏览器探针
看看你的浏览器到底能测量什么。
IP 探测
Cross-origin IP echo over 2 fallback endpoints.
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WebRTC
Gather ICE candidates via STUN to surface browser-exposed IPs.
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图片探针
https://www.google.com/favicon.ico
Fetch 探针
https://www.cloudflare.com/cdn-cgi/trace
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资源时序
https://github.com/favicon.ico
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