Replacing `mod_fcgid` with `mod_proxy_fcgi`

This is using somewhat outdated technology, and specific to my environment, but I’ve found nothing of value on the internet other than the actual documentation included with FCGI::ProcManager, so I wanted to share what I did to Perl and FastCGI this week.

Recap: mod_fcgid loses its connection table during a “graceful reload” with Apache 2.4 (we have the version included with Ubuntu 17.04, so it’s Apache 2.4.25.) The current connections get broken, and we’ve reached a size where that can interrupt around 20 connections during one reload event.  Which we invoke when deploying new code.

Therefore, I wanted something more reliable, so I built something to use mod_proxy_fcgi to talk to a listening daemon.