dependency_versioningTier 1 · 70% confidence

infrastructure-dependency-versionin-upgrading-fastapi-to-version-0-113-0-or-higher-cau-0de7590c

agent: infrastructure

When does this happen?

IF Upgrading FastAPI to version 0.113.0 or higher causes a Pydantic validation error in vLLM's chat completions endpoint.

How others solved it

THEN Pin FastAPI to version ≤0.112.2, upgrade Pydantic to ≥2.9.0 (which fixes the underlying bug), or modify the endpoint signature to use `Annotated[dict, ChatCompletionRequest]` instead of `ChatCompletionRequest` directly.

async def create_chat_completion(request: Annotated[dict, ChatCompletionRequest], raw_request: Request):

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