Amber Shen 050b779d97 fix(ollama): respect scheme-less base_url (#34042) ...

Fixes #33986.

Summary:
- Normalize scheme-less `base_url` values (e.g., `ollama:11434`) by
defaulting to `http://` when the input resembles `host:port`.
- Preserve and merge `Authorization` headers when `userinfo` credentials
are present, both for sync and async clients.
- Add unit tests covering scheme-less host:port and scheme-less userinfo
credentials.

Implementation details:
- Update `parse_url_with_auth` to accept scheme-less endpoints,
producing a cleaned URL with explicit scheme and extracted auth headers.
- No changes required in `OllamaLLM`, `ChatOllama`, or
`OllamaEmbeddings`—they already consume the cleaned URL and headers.

Why:
- Previously, scheme-less inputs caused `parse_url_with_auth` to return
`(None, None)`, leading Ollama clients to fall back to defaults and
ignore the provided `base_url`.

Tests:
- Extended `libs/partners/ollama/tests/unit_tests/test_auth.py` to cover
the new cases.

Notes:
- Default scheme chosen is `http` to match common Ollama local
deployments. Users can still explicitly provide `https://` when
appropriate.

---------

Co-authored-by: Mason Daugherty <mason@langchain.dev>
Co-authored-by: Mason Daugherty <github@mdrxy.com>

2026-04-06 21:39:33 -04:00

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