Yeah, from what I understand 400 means "fix it at the client's end" and 500 means "fix it at the server's end" which seems to be what the RFC thinks, too: http

Yeah, from what I understand 400 means "fix it at the client's end" and 500 means "fix it at the server's end" which seems to be what the RFC thinks, too: https://httpwg.org/specs/rfc9110.html#overview.of.status.codes https://httpwg.org/specs/rfc9110.html#overview.of.status.cod... > The 4xx (Client Error) class of status code indicates that the client seems to have erred. > The 5xx (Server Error) class of status code indicates that the server is aware that it has erred or is incapable of performing the requested method.