OpenAI Responses may return code=rate_limit_exceeded in a response.failed SSE event while the HTTP status remains 200. Classify these failures as 429 so configured pool-mode retries and account failover are applied. No account-level rate-limit state is written on this path: the 200-stream response headers carry normal quota snapshots, and retry semantics stay owned by the failover engine.
Ignore compact keepalive bytes when determining whether semantic output has started, preserving safe retries before real output.
Implements #2646: the risk-control content audit can now send OpenAI
Moderations requests through a proxy from IP Management - Proxy Servers.
Backend:
- ContentModerationConfig gains proxy_id (nil = direct, unchanged default)
- update semantics: null keeps, 0 clears, >0 selects (validated to exist)
- moderation calls build the client via the shared httpclient pool; proxy
resolution failure surfaces as a moderation error and never silently
falls back to direct connection
- proxy_id -> URL resolution cached 60s (single-entry, invalidated on
config save) so the pre-block hot path does not hit the DB per request
- test-key endpoint accepts proxy_id too (null = saved config's proxy,
0 = force direct), so input-key/saved-key tests exercise the same path
- proxy usage/inactivity logged (content_moderation.proxy_enabled /
proxy_not_active) without leaking credentials
Frontend:
- ProxySelector in the risk-control basic settings tab, proxy list loaded
non-blockingly; save and test payloads carry proxy_id; zh/en i18n
Add a dedicated client first-message timeout while preserving the legacy 30-second default.
Use the resolved value for both the WebSocket read deadline and structured timeout logs, and document tuning for large requests or slow links.
Add configuration, validation, handler, and resolver regression coverage.
Refs #4158
Treat a non-empty messages dispatch model as a caller-approved fallback after account-level mapping, without reclassifying the requested Claude family.\n\nAdd Fable forwarding and endpoint boundary regression coverage.\n\nFixes #4177
Case B: when a slot wait flushes SSE ping comments first (Writer.Written
becomes true), the previous ensureForwardErrorResponse short-circuited
on `c.Writer.Written()` and returned false without notifying the client.
Subsequent upstream errors (http2 timeout, stream INTERNAL_ERROR, etc.)
produced silent EOF; Codex CLI reported "stream closed before
response.completed" just like the user-slot timeout case.
Remove the Written() early return; coerce streamStarted to true when
Writer has already been written to, and let handleStreamingAwareError
walk the existing logic — which now (thanks to the previous commits)
emits a protocol-compliant response.failed for /responses paths and the
legacy `event: error` for others.
Update tests that previously asserted "do not override written response":
the new contract is to *append* an SSE terminal frame so the client sees
a clean close instead of EOF. recoverResponsesPanic inherits this fix.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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