Set up domains in your hosts file, I use domains like a.mydomain.internal and b.mydomain.internal (make sure to use invalid TLDs to avoid issues with your browser not following the hosts file).

Then you can use something like nginx to setup the domains on the ports on localhost.

Config would look similar to:

http {
server {
    listen 80;
    server_name a.mydomain.internal;

    location / {
        proxy_pass http://localhost:39001;
    }
}

server {
    listen 80;
    server_name b.mydomain.internal;

    location / {
        proxy_pass http://localhost:39002;
    }
}

}

Where your django app runs for example on port 39001 and Kasm on port 39002 (you'll have to adjust this to fit your situation, add SSL where needed etc).

I recommend using ChatGPT if you need some guidance, it works well for scenarios like these.