I was working to adjust the TL3 settings for one of my sites and pulled up the TL3 requirements page for a few TL2 users to use as a gauge. That worked fine but when I refreshed the page to see the edits I had made to the TL3 settings it gave me a 404.
My first thought was that the client side had the route (which is why it worked initially) but that the Rails side was missing the route. Creating the Rails route on local worked. Which leads me to this: