Wouldn't a decent load-balancer/proxy server (e.g.: haproxy) in front of the application servers be a good idea to redirect traffic to a graceful "Ooops" page/s

Wouldn't a decent load-balancer/proxy server (e.g.: haproxy) in front of the application servers be a good idea to redirect traffic to a graceful "Ooops" page/server when something like this happens?