https://blog.wongcw.com/2019/04/10/edge-canary%e6%96%b0%e7%89%88%e7%99%bc%e5%b8%83%ef%bc%9a%e5%8f%af%e9%9d%88%e6%b4%bb%e8%a8%ad%e7%bd%ae%e6%94%b6%e8%97%8f%e6%ac%84%e9%a1%af%e7%a4%ba/