https://blog.wongcw.com/2020/02/28/edge-canary%e6%96%b0%e7%89%88%e5%85%81%e8%a8%b1%e8%a8%ad%e7%bd%ae%e7%82%ba%e9%bb%98%e8%aa%8d%e7%80%8f%e8%a6%bd%e5%99%a8%e4%bd%86%e5%be%ae%e8%bb%9f%e6%8e%a8%e8%96%a6%e4%b8%8d%e8%a6%81%e9%80%99%e9%ba%bc/