WebSocket endpoints now accept then close with real codes (4001 auth, 4003
permission) so clients detect auth failure via event.code instead of an opaque
403 handshake, ending the infinite reconnect storm. _authenticate_websocket
logs the actual JWT/API-key failure reason. Frontend WS consumers stop on
auth rejection and use capped exponential backoff for transient failures.
async_network.request() routes proxy 502/503/504 (HTML) responses to
NetworkError so migration/maintenance surface a clean 503 instead of a
500 JSON-parse traceback.
busya
a1cb18fad9