A close() before accept() carries the HTTP status of the refused
upgrade, not a WebSocket close code: RSGI (granian) uses the value
verbatim as the response status, so 4401 panicked on the invalid status
(InvalidStatusCode) and — granian being built with panic = "abort" —
aborted the worker and took the whole app down. ASGI servers answer 403
regardless, and browsers report a refused handshake as an abnormal close
(1006), so the 4401/4403/4404 codes never reached clients anyway.
Reject 401/404/403 to mirror GET /api/games/{id}, and classify a failed
first connection in the game page through the REST API so players still
see "session expired" / "game no longer available" instead of a retry
loop. Add a regression test asserting every pre-accept rejection uses a
status in the HTTP range.
woggioni
2910fc4600