fix(providers): avoid duplicate /v1 in OpenAI Responses fallback URL

[hdcodedev]

Context

Fixes #5979.

OpenAI-compatible Responses fallback requests could build invalid URLs like /v1/v1/responses when a custom base URL already included /v1 (or repeated /v1 suffixes). This caused fallback request failures for valid user configurations.

Implementation

• Updated src/api/providers/openai-responses.ts to normalize custom base URLs before calling the fallback Responses endpoint.
• The fallback now always resolves to a single /v1/responses path (no duplicated /v1).
• Added regression tests in src/api/providers/__tests__/openai-responses.spec.ts for base URLs like /v1 and /v1/v1///.

How to Test

• From src/, run:
  • pnpm test api/providers/__tests__/openai-responses.spec.ts
• Verify the new tests pass and assert fetch is called with:
  • https://api.example.com/v1/responses
• Confirm there is no duplicated /v1/v1/responses in fallback URL expectations.

Notes

• Potential follow-up: apply the same normalization to src/api/providers/openai-native.ts and src/api/providers/apertis.ts.

[changeset-bot]

🦋 Changeset detected

Latest commit: 7208c04

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
kilo-code	Patch

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[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Clean bug fix that extracts URL construction into a dedicated getResponsesApiUrl() method, properly normalizing base URLs that already contain /v1 to avoid path duplication in the fetch-based fallback. The regex approach is sound — trailing slashes are stripped first, then repeated /v1 segments are collapsed, and the method always appends /v1/responses. Edge cases (empty/whitespace URLs, multiple /v1 segments, trailing slashes) are well handled. Tests cover the key scenarios.

Files Reviewed (3 files)

• .changeset/fair-dingos-bake.md - changeset
• src/api/providers/openai-responses.ts - new getResponsesApiUrl() method with URL normalization
• src/api/providers/__tests__/openai-responses.spec.ts - extracted mock helper, added 2 new test cases

[kevinvandijk]

Thanks!