https://blog.wongcw.com/2020/11/11/%e7%84%a1%e9%9c%80%e6%93%b4%e5%b1%95%e7%a8%8b%e5%ba%8fedge-canary%e7%8f%be%e6%95%b4%e5%90%88%e8%a4%87%e8%a3%bd%e6%96%87%e6%9c%ac%e9%8f%88%e6%8e%a5%e5%8a%9f%e8%83%bd/