[kamenkadmitry]

Summary

• Rerank handler ignored per-connection proxy pinning. handleRerank used plain fetch() without runWithProxyContext, so rerank requests always egressed directly — bypassing the SOCKS5 proxy configured on the connection. This caused failures for providers that block certain IP ranges (e.g. Voyage AI returns 403 from Russian IPs, making all rerank model tests fail while embedding tests on the same provider passed).

• Voyage AI rejects top_n with HTTP 400. The default Cohere-compatible request adapter in transformRequestForProvider passed top_n through unconditionally. Voyage AI's rerank API does not accept this parameter and returns: "Argument 'top_n' is not supported by our API". A new "voyage" format entry strips top_n while preserving all other Cohere-compatible fields.

• modelTestRunner did not pass connectionId to the embeddings handler during test-all, so per-connection proxy resolution was not triggered for embedding model tests either (the embeddings service resolves proxy from credentials.connectionId internally, but the options.connectionId parameter enables the same path when credentials don't carry it).

Changes

File	Change
open-sse/config/rerankRegistry.ts	Add format: "voyage" to voyage-ai provider entry
open-sse/handlers/rerank.ts	Import resolveProxyForConnection + runWithProxyContext; add connectionId param to handleRerank; wrap fetch in runWithProxyContext when connectionId is set; add "voyage" format to transformRequestForProvider that strips top_n
src/app/api/v1/rerank/route.ts	Pass credentials.connectionId to handleRerank
src/lib/api/modelTestRunner.ts	Pass connectionId to handleValidatedEmbeddingRequestBody
tests/unit/rerank-providers-5332.test.ts	4 new tests: voyage-ai strips top_n, preserves body without top_n, registered with format=voyage, alias resolves correctly

Root cause analysis

The rerank handler was the only handler that didn't use the proxy infrastructure — chatCore uses runWithProxyContext via chatHelpers.ts, embeddings uses it via src/lib/embeddings/service.ts, images and count_tokens use it directly in their routes. Rerank was missed when proxy support was added across handlers.

Test plan

• node --import tsx/esm --test tests/unit/rerank-providers-5332.test.ts — 11/11 pass (4 new)
• node --import tsx/esm --test tests/unit/rerank.test.ts — 12/12 pass
• node --import tsx/esm --test tests/unit/rerank-openrouter-6574.test.ts — pass
• node --import tsx/esm --test tests/unit/embedding-rerank-provider-registry.test.ts — pass
• npm run typecheck:core — pass
• npx eslint on all changed files — pass
• Pre-commit hooks (prettier, eslint, docs-sync, any-budget check, tracked-artifacts) — pass
• Manual: verify Voyage AI rerank models pass test-all with per-connection SOCKS5 proxy

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[kamenkadmitry]

Closing in favor of upstream PR: cheaper-inference#7420