Yeah, URLs really don’t have much in the way of semantics. Path is clearly intended for hierarchical data and query for non-hierarchical data, and there are strong customs, some commonly supported or even enforced by libraries, but no actual rules. Ultimately, it’s just a string that the server can decide what to do with.

The really funny thing about this is that, when I was worrying about possible side effects if I responded 404, I somehow completely forgot how much of the web’s history the path has been useless for. Paths have won. No one really starts new things with URLs like /item?id=… any more. Yay!