https://blog.wongcw.com/2021/10/08/facebook-connectivity%e6%8e%a8%e5%87%ba%e5%8f%af%e5%8a%a0%e9%80%9f%e5%85%89%e7%ba%96%e9%83%a8%e7%bd%b2%e7%9a%84%e6%a9%9f%e5%99%a8%e4%ba%ba/