DNS lookup issue when running my Go app in Termux

Just create /etc/resolv.conf and append nameserver 8.8.8.8 then this problem will be resolved.

According to src/net/dnsclient_unix.go, if /etc/resolv.conf is absent, localhost:53 is chosen as a name server.

Since the Linux in Android is not so "standard". /etc/resolv.conf is not available. The app then just keep looking up host in localhost:53.