Align Codex WebSocket metadata and add stream idle timeout (Fixes #2772) - #3376
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Included review availability: Your plan provides up to 4 included reviews per hour; 1 remains after this review. 📝 WalkthroughWalkthroughThe PR aligns Codex WebSocket handshake identity headers with the current contract and adds configurable established-stream idle-timeout handling. It adds transport tests for header forwarding, socket replacement, timeout lifecycle, fallback, abort behavior, and partial-output handling. Documentation describes the behavior. ChangesCodex WebSocket transport
Estimated code review effort: 3 (Moderate) | ~25 minutes Merge Risk: 🟡 Moderate · up to The PR adds a 300-second idle timeout for Codex WebSocket streams, but a caller paused after partial output could leave the transport’s request slot held even after the socket closes, blocking later requests. Merge readiness requires confirming independent request-slot release or explicitly accepting this bounded availability risk. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
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Actionable comments posted: 2
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Inline comments:
In `@docs/providers/quick-reference.md`:
- Around line 246-248: Update the WebSocket timeout description near the
idle-timeout sentence to state that the five-minute timer resets only when a
valid text frame is received, rather than on every incoming frame; preserve the
surrounding handshake and socket-close behavior.
In
`@packages/providers/src/openai-responses/openAIResponsesWebSocketTransport.ts`:
- Around line 400-405: Update the idle-timeout handling in the WebSocket
transport and RequestFrameSource integration to invalidate and close the socket
when the timer expires, not only call fail. Pass an invalidation callback into
RequestFrameSource, invoke it from the timeout callback, and add coverage that
pauses after partial output and confirms the socket closes before the next
iterator read.
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docs/providers/quick-reference.mdpackages/providers/src/openai-responses/openAIResponsesExecutor.tspackages/providers/src/openai-responses/openAIResponsesExecutor.websocket.test.tspackages/providers/src/openai-responses/openAIResponsesWebSocketTransport.handshakeHeaders.test.tspackages/providers/src/openai-responses/openAIResponsesWebSocketTransport.idleTimeout.test.tspackages/providers/src/openai-responses/openAIResponsesWebSocketTransport.test.tspackages/providers/src/openai-responses/openAIResponsesWebSocketTransport.ts
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- packages/providers/src/openai-responses/openAIResponsesWebSocketTransport.test.ts
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OpenCodeReview — PR #3376
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A consumer suspended at a yield holds the generator's finally block (and therefore socket invalidation) hostage until its next read. Recording only the stream-interruption failure left the stalled socket open and active, diverging from the upstream Codex client, which drops the socket on idle expiry. Pass an invalidation callback into RequestFrameSource and invoke it from the idle-timer callback, guarded by the same settled predicate as fail(), so a late firing cannot invalidate an already-settled request. Also narrows the documented reset rule to valid text frames: malformed and non-text frames fail the stream rather than reset the timer. Addresses CodeRabbit findings on #3376.
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@coderabbitai response to both open findings: 1. docs/providers/quick-reference.md — "each incoming frame" overstates the reset rule: Valid. The implementation resets the timer only on valid text frames; malformed JSON and non-text frames fail the stream instead. Fixed in 1715f0d — the sentence now reads "resets on each valid text frame." 2. openAIResponsesWebSocketTransport.ts — socket stays open when the consumer pauses after partial output: Valid. With the generator suspended at Verified: the six idle-timeout tests (now seven) plus the full WebSocket transport/executor focused set pass (57/57), providers |
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Analysis of both inline findings on the idle-timer callback (same line, same scenario — one reply covers both): The reported race is real but is the timeout's specified behavior, and matches upstream. The scenario requires a terminal frame to land in the single event-loop dispatch tick between the idle deadline elapsing and the timer callback running — the tail end of a 300 s window in production. When the deadline elapses first, the stream has exceeded its idle budget, and failing it is what a bounded idle timeout means. Upstream Codex ( The thread 1 suggestion is behaviorally identical to the shipped code. The thread 2 suggestion (defer via a 0-timeout recheck) trades a microscopic window for a new layer of state. It requires epoch tracking to be correct: a valid non-terminal frame arriving during the deferred tick calls Classification: Reject for both. The shipped semantics are the intended ones — an expired idle window fails the stream, exactly as in the pinned upstream client — and both proposed changes either leave the reported scenario untouched or add complexity that diverges from the client we are matching. |
PR #2750 matched LLxprt's existing Codex HTTP headers on the WebSocket handshake and bounded the connect phase. Upstream Codex additionally sends request-identity headers and enforces an idle timeout on the established stream, both validated against openai/codex@f21dc46. Handshake metadata: upstream dropped the underscore forms in #22193 ("some proxies reject `_`"), so the handshake now sends hyphenated `session-id`, `thread-id`, and `x-client-request-id` in place of `session_id`. LLxprt has no separate thread identity plumbed to the provider layer, and upstream sets `x-client-request-id` = thread id verbatim, so all three resolve to the same runtimeId that previously filled `session_id`. The value is unchanged, so connection reuse and identity-based reconnection behave exactly as before; only the wire names change. Authorization, ChatGPT-Account-ID, originator, custom, and OpenAI-Beta headers are preserved untouched. No User-Agent is synthesized: upstream sends one via vacant-only defaults, but nothing indicates the service requires it, and users can already set it through custom headers. The HTTP/SSE and image-backend paths keep their underscore forms; aligning those is a separate follow-up. Stream liveness: the transport previously had no post-handshake stall detector, so a half-open socket could hang a turn forever. The frame source now arms a 300000 ms idle timer (upstream's `stream_idle_timeout_ms` default, injectable via `streamIdleTimeoutMs`, disabled at <= 0) that resets on every valid text frame and is cleared on terminal intake, failure, and detachment. Expiry fails the request with a StreamInterruptionError; the existing finally-block invalidates the socket so the next request reconnects, and the existing streamOverWebSocketOrFallback boundary falls back to HTTP only before the first yielded IContent, never replaying partial output. Undici does not surface ping/pong as message events, so control frames alone cannot reset the timer, matching upstream's pump semantics. Tests are behavioral over the FakeSocket harness: exact handshake headers at both executor and transport level, identity-absence when runtimeId does not resolve, idle expiry closing the socket and reconnecting, reset-on-activity, abort-outcome preservation, terminal cleanup with socket reuse, and the pre-event fallback vs post-output rethrow boundary. Handshake-header transport tests live in their own file because the main transport test file sits at the 800-line lint ceiling. Docs: quick-reference gains a Codex WebSocket transport section covering the header contract and both timeouts. Decisions and upstream evidence are recorded in project-plans/issue2772/PLAN.md. Verification: focused suites, the full providers suite (582/582), the full monorepo test run (one unrelated contention flake re-verified green in isolation), lint, typecheck, format, and build all pass. The startup smoke test reaches the provider but the stepfun-37 account currently returns "no active step plan subscription", which is external to this change.
A consumer suspended at a yield holds the generator's finally block (and therefore socket invalidation) hostage until its next read. Recording only the stream-interruption failure left the stalled socket open and active, diverging from the upstream Codex client, which drops the socket on idle expiry. Pass an invalidation callback into RequestFrameSource and invoke it from the idle-timer callback, guarded by the same settled predicate as fail(), so a late firing cannot invalidate an already-settled request. Also narrows the documented reset rule to valid text frames: malformed and non-text frames fail the stream rather than reset the timer. Addresses CodeRabbit findings on #3376.
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TLDR
Completes the #2772 follow-up to #2041/#2750: the Codex Responses WebSocket handshake now carries upstream's request-identity headers (hyphenated
session-id,thread-id,x-client-request-id) in place of the underscoresession_id, and the established stream gains a 300 s activity-resetting idle timeout that closes silent sockets and follows the existing partial-output-safe fallback boundary. All behavior validated againstopenai/codex@f21dc46.Dive Deeper
Handshake metadata (AC 1–4). Upstream dropped the underscore header forms in openai/codex pull request 22193 ("
_is rejected by some proxies"), and setsx-client-request-id= thread id verbatim. LLxprt has no thread identity plumbed to the provider layer, so all three headers resolve to the sameruntimeIdthat previously filledsession_id(identity fallback chain unchanged:invocation.runtimeId→options.runtime?.runtimeId). Because the value is unchanged, connection reuse and identity-based reconnection behave exactly as before; only the wire names change. Authorization,ChatGPT-Account-ID,originator, custom, andOpenAI-Betaheaders are preserved untouched. No User-Agent is synthesized: upstream sends one via vacant-only defaults, but nothing indicates the service requires it, and users can already set one through custom headers. The HTTP/SSE and image-backend paths keep their underscoresession_id; aligning those is a separate follow-up.Stream liveness (AC 5–7). The transport previously had no post-handshake stall detector, so a half-open socket could hang a turn indefinitely.
RequestFrameSourcenow arms a 300 000 ms idle timer (upstreamstream_idle_timeout_msdefault, exported asSTREAM_IDLE_TIMEOUT_MS, injectable viastreamIdleTimeoutMs, disabled at<= 0) that resets on every valid text frame and is cleared on terminal intake, failure, and detachment. Expiry fails the request with aStreamInterruptionError; the existingfinallyinvalidates the socket so the next request reconnects, andstreamOverWebSocketOrFallbackfalls back to HTTP only before the first yieldedIContent— never replaying partial output. Undici does not surface ping/pong as message events, so control frames alone cannot reset the timer, matching upstream's pump semantics.Tests (AC 8). Behavioral over the existing
FakeSocket/SocketHarnessconventions with real timers and small injected timeouts:session_idis gone) and transport level, plus identity-absence whenruntimeIddoes not resolveStreamInterruptionError, socket closed by client, next request reconnectsAbortErroronWebSocketFallback; the provider's existing 3-consecutive-failure sticky demotion is unchanged)Handshake-header transport tests live in their own file because the main transport test file sits at the 800-line lint ceiling.
Docs (AC 9).
docs/providers/quick-reference.mdgains a Codex section documenting the header contract, the 15 s handshake timeout, and the idle-timeout semantics. Decisions and upstream evidence are recorded inproject-plans/issue2772/PLAN.md.Non-goals respected: no sixty-minute recovery, no configurable WS selection (#2756), no multiplexing/pooling, no public connection-management abstraction, no realtime audio.
Reviewer Test Plan
bun test packages/providers/src/openai-responses/openAIResponsesWebSocketTransport.idleTimeout.test.ts packages/providers/src/openai-responses/openAIResponsesWebSocketTransport.handshakeHeaders.test.ts packages/providers/src/openai-responses/openAIResponsesExecutor.websocket.test.tscd packages/providers && bun ../../scripts/run_bun_tests.ts --workspace providersTesting Matrix
macOS (
npm run test,lint,typecheck,format,buildall green; the startup smoke test reaches the provider but the stepfun-37 account currently returns "no active step plan subscription", external to this change).Linked issues / bugs
Fixes #2772
Follow-up to #2041 and PR #2750. Related: #2756, #3047.
Summary by CodeRabbit
New Features
Bug Fixes