Proxy Protocol

### Describe the feature request
Would be very useful when using the server behind a reverse proxy.
Now it's not possible to read the client endpoint

### Which project is your feature request related to?

- Client
- ManagedClient
- Server
- Generic

### Describe the solution you'd like
I think we should implement Proxy Protocol as stated here:
Proxy protocol documentation
[https://www.haproxy.com/blog/use-the-proxy-protocol-to-preserve-a-clients-ip-address/](https://www.haproxy.com/blog/use-the-proxy-protocol-to-preserve-a-clients-ip-address/)
[https://github.com/haproxy/haproxy/blob/master/doc/proxy-protocol.txt](https://github.com/haproxy/haproxy/blob/master/doc/proxy-protocol.txt)

### Describe alternatives you've considered
No alternatives are possible

### Additional context