Files
litellm/tests/router_unit_tests
Martin Gauthier dd087c8cca 🐛 fix: propagate headers in router embedding calls (#18844)
Fix router embedding methods to properly propagate proxy model
configuration headers to LLM API calls by calling
_update_kwargs_before_fallbacks() just like completion() does.

Previously, router.embedding() and router.aembedding() manually
set num_retries and metadata but didn't call
_update_kwargs_before_fallbacks(), which meant default_litellm_params
(including headers) were not propagated correctly.

Changes:
- Replace manual kwargs setup with _update_kwargs_before_fallbacks()
  in _embedding method (litellm/router.py:3318)
- Apply Black formatting to router.py for consistency
- Add comprehensive unit tests for header propagation
- Add integration tests for various router configurations

Tests verify:
- Headers from default_litellm_params are included in embedding calls
- Metadata (model_group) is properly set
- Consistency between completion() and embedding() behavior
- Support for deployment-specific headers, fallbacks, and retries
2026-01-09 23:57:18 +05:30
..

Router component unit tests.

Please name all files with the word 'router' in them.

This is used to ensure all functions in the router are tested.