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a06ddb38e6
Every non-streaming Codex chat request for a ChatGPT-account connection failed
instantly with [502]: Response body is already used (reset after 1m). The
streaming/playground path was unaffected.
Root cause: peekCodexSseTransientError (open-sse/executors/codex.ts) peeked the
SSE prefix with response.body.getReader(), then called reader.releaseLock() and
response.body.getReader() a SECOND time on the same already-disturbed body to
build the replacement stream. Re-acquiring a reader on a disturbed body throws
on undici ('Response body is already used'); chatCore's generic upstream-error
handling then stamped the TypeError with a default 60s cooldown, masking a pure
code defect as a rate limit (and tripping the codex circuit breaker).
Fix: keep the single reader already held; never touch response.body again.
TDD: a getReader spy that throws on the 2nd acquire reproduces the exact hazard
— 1 test RED against the release code, 2/2 GREEN with the fix; the replacement
body stays byte-identical to the upstream SSE. No regression across the codex
unit suite. Reproduced live on the VPS 2026-07-16.