This is a script that automatically makes builds of nessie’s usefulmod for 1.12. It runs every 15 minutes and only posts a new build if new commits have been made.
You can find the latest (and only the latest) build here.
It could sometimes happen that you get a 404 while accessing this path. That just means a new build is being made. It’s nothing to worry about. Check back in a minute or so.