https://blog.wongcw.com/2021/02/04/edge-canary%e6%96%b0%e5%a2%9e%e8%bf%b7%e4%bd%a0%e5%8f%b3%e9%8d%b5%e8%8f%9c%e5%96%ae%e5%8a%9f%e8%83%bd/