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peekCodexSseTransientError() ran before chatCore's normal readiness/idle-timeout pipeline and read the first SSE chunk with a bare reader.read() — no timeout wrapper. A 200 text/event-stream body that never emitted a byte hung for ~15min (901399ms observed) before the platform killed the connection and surfaced a generic 502. Wrap the peek loop's read and the re-assembled passthrough body's pull() in readStreamChunkWithTimeout, bounded PER READ (not a total deadline) so a long-but-alive reasoning stream keeps resetting the window on every chunk it emits. On timeout the reader is cancelled and the request now fails fast with a 504 instead of hanging. New small module open-sse/executors/codex/bodyTimeout.ts holds the wrapping helpers to keep codex.ts within its frozen size baseline.
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- fix(sse): bound the Codex SSE peek/passthrough body reads with a per-read timeout so a silently stalled upstream body settles in FETCH_BODY_TIMEOUT_MS instead of hanging ~15min and returning a generic 502 (#8020)