[Catalyst] Speeding up recovery from 503 errors + backend

[Paul Makepeace]

>From time to time I forget to restart the Catalyst backend and Apache
reports the usual 503 Service Temporarily Unavailable error.
Annoyingly, even when the backend is restarted Apache seems to
negatively cache that "backend gone away" result and keep serving
503s. Is there a way to have it re-check every time, or some other
solution that doesn't require an Apache restart?

Paul