The challenge environment in Ret 2 Shell is deployed on Kubernetes, it may contains multiple containers. The k8s pod could run containers together, and share the same host network (for example, the database container and the web container could reach each other by localhost:port).
But WebSocket Reflector X is a controlled proxy that provided by the platform server, which means it can only proxy one port at a time. If you want to expose multiple ports or provide a more complex network environment, you can simply add this container-proxy to your pod, and expose 7866 port to the platform server. The player could access the 7866 port from WebSocket Reflector X, and use this port as a common HTTP/Socks4/Socks5 mixed-in proxy port in its own computer, and then, it will be able to access the complete network environment of the pod using address 127.0.0.1.
docker pull ghcr.io/ret2shell/container-proxy:main
you can try it on your local machine.
docker run --rm -it -p 7866:7866 ret2shell/container-proxy:main