一般通过 caddy

<domain> {
    tls <your email>
    reverse_proxy <ip:port>
}

负载均衡

<domain> {
    tls <your email>
    reverse_proxy {
      to <ip1:port1> <ip2:port2> ... ...
    }
}

Cloudflare DNS

<domain> {
    tls { dns <provider> ... }
    reverse_proxy <ip:port>
}

其中 provider 是 cludflare 就填写为

dns cloudflare ... ...