Change backend when reaching maxconn HAProxy
I want our HAProxy configuration to fail over to the backup server in the backend, or to another specified backend, in the event that maxconns is reached on all backend servers.
This is to display a static over capacity message that I'll serve up from another server.
From what I can tell by reading the backup server is only used if the backend servers are all "down", not when they are full of traffic.
How can I accomplish this behaviour?