https://blog.wongcw.com/2022/03/31/edge-canary%e6%96%b0%e7%89%b9%e6%80%a7%ef%bc%9a%e5%8f%af%e5%9b%ba%e5%ae%9a%e5%92%8c%e5%bf%ab%e9%80%9f%e6%89%93%e9%96%8b%e6%a8%99%e7%b1%a4%e7%b5%84/