Yep. 4xx: "You asked for something in a way that I can't respond" (auth error, unknown path, etc.) 5xx: "You asked for something in a valid way, but I can't r

Yep. 4xx: "You asked for something in a way that I can't respond" (auth error, unknown path, etc.) 5xx: "You asked for something in a valid way, but I can't respond right now" (outage, bug, etc.)