Move query params to create_pass_through_route call in Langfuse passthrough

[jason-nance]

Title

Fix an error when using the Langfuse passthrough by moving an argument to the correct function invocation.

Issue

This error:

create_pass_through_route.<locals>.endpoint_func() got an unexpected keyword argument 'query_params' in litellm/proxy/vertex_ai_endpoints/langfuse_endpoints.py in langfuse_proxy_route at line 132

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• I have Added testing in the tests/litellm/ directory, Adding at least 1 test is a hard requirement - see details
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Type

🐛 Bug Fix

Changes

query_params appears to now be expected as an argument to create_pass_through_route rather than the returned endpoint_func. It is properly merged into the final request query params when passed there, so I've just moved the argument.

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Project	Deployment	Preview	Comments	Updated (UTC)
litellm	Ready	Preview	Comment	Dec 8, 2025 4:43pm

[ishaan-jaff]

lgtm