SpiderX & HAProxy

[rbdtbhsdtae]

Here's the situation: I use HAProxy to hide the dashboard, statistics and other management stuff.
Let's say that my domain in SNI for Reality: mydomain.com
Also, I have subdomains for different clients:
ex1.mydomain.com
ex2.mydomain.com
ex3.mydomain.com
ex4.mydomain.com
I want to implement the following logic: If a user uses the domain ex1.mydomain.com HAProxy redirects him to mydomain.com. But if the user uses ex1.mydomain.com/randompage then HAProxy redirects him to Xray server. Can I use SpiderX to implement this? I'm a bit confused how it works, when connecting to the server it immediately uses ex1.mydomain.com/randompage, or does it try to initialize the connection to mydomain.com?
The main purpose of my idea: implement all connections on port 443 and hide the fact of using subdomains for reality. (my server acts as a file-sharing server)

[rbdtbhsdtae]

I have researched more information regarding my question, and lost the point of using haproxy. will switch to nginx.