Files
OmniRoute/tests/unit
Diego Rodrigues de Sa e Souza 3f457cc77b fix(codex): surface capacity errors embedded in 200-OK SSE streams (#6710)
* fix(codex): surface capacity errors embedded in 200-OK SSE streams

Codex sometimes answers with HTTP 200 and a text/event-stream body whose
payload carries a transient error mid-stream (e.g. "Selected model is at
capacity...", server_is_overloaded, service_unavailable_error). Because the
outer HTTP status was 200, this looked like a successful response to every
caller — no retry, no circuit breaker, and no combo/account fallback ever
engaged, so a healthy account sat idle while the request silently failed or
truncated.

Add peekCodexSseTransientError() to open-sse/executors/codex.ts: it peeks the
first bytes of a text/event-stream Codex response, pattern-matches the known
transient-error signatures, and converts a match into a real 503 Response via
errorResponse() (Hard Rule #12 — sanitized, never raw upstream text). A 503 is
already a recognized provider-failure status in accountFallback.ts, so combo
routing and connection cooldown pick it up automatically. When no error
signature is found, the peeked prefix is prepended back onto the remaining
upstream body so the passthrough stays byte-identical to the unmodified
response.

Regression guard: tests/unit/codex-sse-capacity-fallback.test.ts — a
model-at-capacity payload and a server_is_overloaded/service_unavailable_error
payload both convert to 503; a normal single-chunk SSE stream and one split
across multiple network chunks both reassemble byte-for-byte unchanged.

Inspired-by: https://github.com/decolua/9router/pull/2452 (sub-bug #3 only —
OmniRoute already covers PR #2452's other two sub-bugs: service_tier "fast"
normalization and reasoning_effort "max" normalization).

Co-authored-by: ryanngit <74137224+ryanngit@users.noreply.github.com>

* chore(6710): re-sync onto release tip; CHANGELOG → changelog.d fragment (fragments-first)

---------

Co-authored-by: ryanngit <74137224+ryanngit@users.noreply.github.com>
2026-07-10 19:39:23 -03:00
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