Roy Tam says to YSITD 怕。 http://blog.gslin.org/archives/2018/01/23/8065/%e5%b0%87%e6%89%be-origin-server-ip-%e4%bd%8d%e7%bd%ae%e8%87%aa%e5%8b%95%e5%8c%96%e7%9a%84-cloudflair/