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feat(gemini): authenticate using x-goog-api-key header - #661
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Switch Gemini provider authentication from query parameters (`?key=...`) to the `x-goog-api-key` HTTP header in alignment with Google Gemini API guidelines. - Override `build_headers` in `GeminiProvider` to populate `x-goog-api-key` and suppress `Authorization: Bearer`. - Remove `key` query parameter construction in `gemini_complete` and `gemini_stream` domain adapters. - Add test coverage in `tests/helpers/test_llms_gemini_auth.py`. Co-authored-by: cecli (gemini/gemini-3.6-flash)
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Oh man, of course there's a header for it! Thank you 🙏 Edit: This really did surprise me during the litellm removal/creating the api domain concept that this was how gemini authenticates. I definitely saw it in the mitmproxy logs while trying to figure out the API differences between the 2+ and 3+ models |
JessicaMulein
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Sep 23, 2026
feat(gemini): authenticate using x-goog-api-key header
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Switch Gemini provider authentication from query parameters (
?key=...) to thex-goog-api-keyHTTP header in alignment with Google Gemini API guidelines.Override
build_headersinGeminiProviderto populatex-goog-api-keyand suppressAuthorization: Bearer.Remove
keyquery parameter construction ingemini_completeandgemini_streamdomain adapters.Add test coverage in
tests/helpers/test_llms_gemini_auth.py.Co-authored-by: cecli (gemini/gemini-3.6-flash)