What does -host-ip and -host-name - mean for server-tls?

[McSinyx]

The rich text documentation for the configuration format lists -host-ip as an option for server-tls. Does it override the server IP argument earlier on? This page is also inconsistent with the sample smartdns.conf, which lists -host-ip for server. Which one is correct?

As for the SNI hostname, is specifying -host-name - for server-tls or server-https any different from omitting the option?

[pymumu]

The -host-ip parameter is used to explicitly set the IP address to the upstream server to avoid bootstrap query, similar to /etc/hosts.
For example, server-tls dns.google -host-ip=1.2.3.4 actually same as server-tls 1.2.3.4 -hostname dns.google

2. -host-name corresponds to the hostname of tls, which is SNI.
   set -host-name to - actually lets smartdns query without setting SNI, the parameter takes effect on DOT and DOH servers.
   For daily use, most of these parameters will be set according to the domain name. Just configure the upstream server using the URL format, such as

server-tls dns.google
server https://dns.google

The following three configurations are actually the same.

server tls://dns.google -host-ip 8.8.8.8
server-tls dns.google -host-ip 8.8.8.8
server-tls 8.8.8.8 -host-name dns.google -tls-host-verify dns.google

These parameters are also the same for server-https

server https://dns.google -host-ip 8.8.8.8
server-https https://dns.google -host-ip 8.8.8.8
server-https 8.8.8.8 -host-name dns.google -tls-host-verify dns.google -host-name dns.google

[McSinyx]

I see, so server-tls (and only the TLS one because I suppose it doesn't make sense for e.g. TCP) also take in a hostname as an argument, alternative to ip[:port]?

[PikuZheng]

This is related to TLS verification. Some server certificates do not have an IP address, which causes the verification to fail when connecting using the IP address. At this time, you have to specify the hostname to pass the authentication.
hostip so that you don't have to resolve the hostname first when connecting.