Let's say I have a domain called mysite.com

mysite.com points to a server which only opens port 443, and each connection will need to go through that and deal with Caddy reverse proxy.

I want to host more services on it.

Let's say I want to host an email service, the easiest thing would be using a subdomain such as mail.mysite.com and reverse proxy each connection to the internal port on which the service run.

Same with a chat service chat.mysite.com.

But for the sake of readability it would be much better to simply have username@mysite.com than username@mail.mysite.com or username@chat.mysite.com.

reverse proxying every request from a subdomain to the right port is pretty straightforward with Caddy, also if you use cloudflare you can proxy with cloudflare each subdomain and have auto SSL certificate without further set up, which is amazing!

But what if I do want my services to be accessed through mysite.com directly instead of a specific per-service subdomain?

Some federated services also have two separate ports for server requests and client requests, which further complicates the process..

Is this service specific and must configured individually for each service? Or there is a way to tell caddy that a specific request going through mysite.com should be redirected through port X.X.X.X? Is there a way Caddy can recognize where requests need to be directed?