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Custom headers configured under openai-compatibility (and any other provider passing through applyCustomHeaders) were silently dropped for the Host key, because Go's net/http reads the wire Host from req.Host, not req.Header["Host"]. As a result, virtual-host routed upstreams (e.g. LiteLLM behind an ingress) saw the base-url's host instead of the user-configured override and returned 404. Detect the Host key with http.CanonicalHeaderKey and assign it to req.Host so it is actually written on the wire. Other headers continue to use Header.Set as before. Fixes router-for-me#2833
Addressing the P1 note from the Codex reviewer: applyCustomHeaders is
also called with a synthetic &http.Request{Header: ...} from the
websockets executors (aistudio_executor.go, codex_websockets_executor.go),
which forward only the header map. The previous continue meant a custom
Host was dropped from that map, regressing virtual-host overrides on
those flows. Mirror the value to both r.Host (for real net/http) and
r.Header (for header-map-only consumers).
…ni, Claude, Codex, OpenAI, and Vertex
feat(api): integrate auth index into key retrieval endpoints for Gemi…
…dex-GPT and Codex-Gemini flows - Introduced `LastImageHashByItemID` in Codex-GPT and `LastImageHashByID` in Codex-Gemini for deduplication of generated images. - Added support for handling `partial_image` and `image_generation_call` types, with inline data embedding for Gemini and URL payload conversion for GPT. - Extended unit tests to verify image handling in both streaming and non-streaming modes.
…outer-for-me#2866) Anthropic has moved the 1M-context-window feature to General Availability, so the context-1m-2025-08-07 beta flag is no longer accepted and now causes 400 Bad Request errors when forwarded upstream. Remove the X-CPA-CLAUDE-1M detection and the corresponding injection of the now-invalid beta header. Also drop the unused net/textproto import that was only needed for the header-key lookup.
…remove-obsolete-1m-beta-header fix(executor): drop obsolete context-1m-2025-08-07 beta header
… links - Added VisionCoder sponsorship information to `README.md`, `README_CN.md`, and `README_JA.md`. - Updated external links to include `target="_blank"` for improved user experience. - Added new logo asset `visioncoder.png` for README use.
- Introduced `refreshIneffectiveBackoff` to prevent tight-looping in auto-refresh when token refresh fails to update expiry. - Adjusted refresh logic to apply backoff when `shouldRefresh` evaluates true. Closes: router-for-me#2830
- Refactored `/healthz` handler to support `HEAD` requests alongside `GET`. - Updated tests to include validation for `HEAD` requests with expected status and empty body. Closes: router-for-me#2929
…m-output-backfill fix(codex): backfill streaming response output
…t-host-header fix(util): forward custom Host header to upstream
- Added `GPT-Image-2` as a built-in model to avoid dependency on remote updates for Codex. - Updated model tier functions (`CodexFree`, `CodexTeam`, etc.) to include built-in models via `WithCodexBuiltins`. - Introduced new handlers for image generation and edit operations under `OpenAIAPIHandler`. - Extended tests to validate 503 response for unsupported image model requests.
…AI image handlers
# Conflicts: # README_JA.md
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