https://blog.wongcw.com/2021/03/31/edge-canary%e6%8c%81%e7%ba%8c%e6%94%b9%e9%80%b2%e4%ba%86%e7%80%8f%e8%a6%bd%e5%99%a8%e7%9a%84%e9%81%b8%e9%a0%85%e5%8d%a1%e6%90%9c%e7%b4%a2%e9%ab%94%e9%a9%97/