HA Prox and App Server on the same servers

Help!
1

Is it possible to run a pair of HA proxy and app servers on the same two servers you are load balancing the application?

2

Hi.
Yes, it is possible if you will place apps to the different ports (in comparing to HA listining ports).
At backend you should use
server 127.0.0.1:[app port]
server [seconadary HA IP]:[app port]

Best Regards.