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Recognize request-size errors before accepting the first upstream event and reuse the existing same-provider HTTP fallback. Keep these failures out of the unsupported cache and discard the rejected persistent socket. Cover classification, forwarding, session reuse, and cleanup races while preserving the current handling of errors after streaming starts.
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Included review availability: Your plan provides up to 8 included reviews per hour; 4 remain after this review. 📝 WalkthroughWalkthrough变更概述新增 Responses WebSocket 的 payload-too-large 错误解析。首个错误事件现在返回不可缓存的 ChangesResponses WebSocket payload-too-large 回退
Priority: ➖ Normal Estimated code review effort: 3 (Moderate) | ~25 minutes Merge Risk: ⚪ Minimal · up to Supported oversized WebSocket requests fall back to HTTP without disabling future WebSocket use, with no unresolved merge-blocking risk identified. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
✨ Finishing Touches🧪 Generate unit tests (beta)
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| const description = `${code} ${type} ${message}`.toLowerCase(); | ||
| return SIZE_SIGNALS.some((signal) => description.includes(signal)) |
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For 400/422/507 events whose size signal is supplied only as a conventional machine code such as request_payload_too_large or context_length_exceeded, this comparison never matches because every entry in SIZE_SIGNALS contains spaces. The classifier therefore returns null, causing the adapter to expose the WebSocket error instead of taking the HTTP fallback this change is intended to provide; normalize underscores and hyphens before matching or include the machine-code variants.
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| "too many bytes", | ||
| "too large", | ||
| ]; | ||
| const DEFAULT_MESSAGE = "upstream rejected the WebSocket request as too large"; |
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When a 413 event omits error.message, this English literal becomes wsResult.message, is stored on the provider-chain entry, and is rendered verbatim in the localized dashboard's provider trace. Users of the other four supported locales therefore see untranslated display text; store a stable error code and translate it in the UI rather than persisting this hardcoded sentence.
AGENTS.md reference: AGENTS.md:L14-L14
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Actionable comments posted: 1
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Inline comments:
In `@src/app/v1/_lib/responses-ws/payload-too-large.ts`:
- Line 50: Update the description normalization in the payload-too-large parser
to convert underscores and hyphens to spaces before matching SIZE_SIGNALS, while
preserving the existing lowercase normalization. Add a test covering an error
containing only error.code set to "request_payload_too_large" and verify it is
recognized as a payload-too-large response.
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📒 Files selected for processing (6)
src/app/v1/_lib/responses-ws/__tests__/payload-too-large.test.tssrc/app/v1/_lib/responses-ws/__tests__/upstream-adapter.test.tssrc/app/v1/_lib/responses-ws/payload-too-large.tssrc/app/v1/_lib/responses-ws/upstream-adapter.tstests/configs/responses-ws-payload-fallback.config.mtstests/unit/proxy/proxy-forwarder-raw-passthrough-regression.test.ts
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Code Review Summary
The change adds a focused classifier for upstream size-rejection errors on the Responses WebSocket path and routes them through the existing generic HTTP fallback, leaving the unsupported-endpoint cache untouched. The adapter integration is guarded by the existing one-shot settle flags (openResolved / requestFinished / socketClosed), so the abort/close races resolve to a single terminal outcome, and the retained-session discard on rejection is exercised by real-socket tests.
PR Size: M
- Lines changed: 375
- Files changed: 6
Validation performed during review: focused vitest config run (82 tests passed, payload-too-large.ts at 100% statements/branches/functions/lines), Biome clean on all changed files, and tsgo --noEmit clean. Forwarder integration confirmed: the new ws_payload_too_large reason flows through the existing failure branch (same-provider HTTP retry, no markResponsesWsUnsupported call, provider-chain entry recorded).
Non-blocking note: the parallel downgradeReason union in src/types/message.ts:243 enumerates the other adapter fallback reasons but has no writers today; if that metadata gets wired up later, ws_payload_too_large will need to be added there as well.
Review Coverage
- Logic and correctness - Clean
- Security (OWASP Top 10) - Clean
- Error handling - Clean
- Type safety - Clean
- Documentation accuracy - Clean
- Test coverage - Adequate
- Code clarity - Good
Automated review by Claude AI
Normalize underscore and hyphen separators before matching upstream size signals. Keep missing upstream messages optional so payload fallback does not introduce a hardcoded display message. Cover code-only errors in both the classifier and real WebSocket adapter tests.
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| const error = event.error && typeof event.error === "object" ? event.error : {}; | ||
| const errorRecord = error as Record<string, unknown>; | ||
| const code = getJsonString(errorRecord.code); | ||
| const type = getJsonString(errorRecord.type); | ||
| const message = getJsonString(errorRecord.message); |
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When an upstream emits a Responses error such as {"type":"error","status":400,"code":"context_length_exceeded","message":"..."}, this replaces the absent event.error with {} and therefore misses every size signal, exposing the WebSocket error instead of falling back to HTTP. Top-level Responses error codes are already treated as valid elsewhere (tests/unit/lib/upstream-error-detection-status.test.ts:53), so the classifier should inspect both the event and its nested error object.
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Read size signals from top-level Responses error fields as well as nested error objects. Preserve upstream messages from either form and keep the explicit status and first-event gates. Cover top-level and mixed envelopes in classifier tests and the real WebSocket adapter regression suite.
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An upstream can accept the Responses WebSocket upgrade but reject the request size in its first event. The adapter currently exposes that error as an SSE response, preventing the existing HTTP fallback from handling the request.
Recognize first-event size errors and retry through the existing HTTP path on the same provider. These failures leave the unsupported-endpoint cache untouched and discard the rejected upstream socket. Errors after streaming has started continue downstream without replaying the request.
The classifier accepts HTTP 413, or 400/422/507 with a recognized size-related code, type, or message. Top-level and nested error fields are both inspected, and machine-code separators are normalized before matching. Upstream messages are preserved when provided; message-less errors return only the stable fallback reason. Other errors retain their current behavior.
Validation:
Greptile Summary
The PR adds same-provider HTTP fallback when a Responses WebSocket upstream rejects an oversized request in its first event.
Confidence Score: 5/5
The PR appears safe to merge because the new fallback remains limited to pre-stream size rejections and preserves the existing provider, request body, and cache behavior.
No actionable new defects or outstanding repository-rule violations were identified; the implementation closes rejected sockets, avoids unsupported-cache pollution, and does not replay errors after streaming has begun.
Important Files Changed
Flowchart
%%{init: {'theme': 'neutral'}}%% flowchart TD A[Send request over upstream WebSocket] --> B{First event} B -->|Payload-size error| C[Close and forget socket] C --> D[Do not update unsupported cache] D --> E[Retry same request and provider over HTTP] B -->|Other first event| F[Expose WebSocket events as SSE] F --> G{Later error} G -->|Any error| H[Forward downstream without replay]Reviews (3): Last reviewed commit: "fix(responses-ws): inspect top-level ups..." | Re-trigger Greptile
Context used (3)