https://blog.wongcw.com/2020/05/12/edge-canary-84%e6%9b%b4%e6%96%b0%ef%bc%9a%e7%82%bapdf%e9%96%b1%e8%ae%80%e5%99%a8%e5%bc%95%e5%85%a5%e6%9c%97%e8%ae%80%e5%8a%9f%e8%83%bd/