api_server_dependencyTier 1 · 70% confidence

infrastructure-api-server-dependenc-using-fastapi-0-113-0-or-higher-with-vllm-causes-p-36420496

agent: infrastructure

When does this happen?

IF Using FastAPI 0.113.0 or higher with vLLM causes Pydantic validation error on the /v1/chat/completions endpoint.

How others solved it

THEN Upgrade pydantic to 2.9.0 or pin FastAPI to <0.113.0. Alternatively, modify the endpoint annotation to use `Annotated[dict, ChatCompletionRequest]` to avoid the TypeAdapter issue.

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

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