https://blog.wongcw.com/2019/04/17/edge-canary%e6%96%b0%e7%89%88%e7%99%bc%e5%b8%83%ef%bc%9a%e4%bf%ae%e5%be%a9%e9%a0%81%e9%9d%a2%e6%bb%91%e5%8b%95%e5%b0%8e%e8%87%b4%e7%80%8f%e8%a6%bd%e5%99%a8%e5%b4%a9%e6%bd%b0%e5%95%8f%e9%a1%8c/