https://blog.wongcw.com/2020/11/27/edge-canary%e6%96%b0%e7%89%b9%e6%80%a7%ef%bc%9a%e8%bc%95%e9%ac%86%e7%a7%bb%e5%8b%95%e6%9f%90%e6%a8%99%e7%b1%a4%e9%a0%81%e8%87%b3%e5%85%b6%e4%bb%96%e8%b3%ac%e8%99%9f%e7%aa%97%e5%8f%a3/