Response content longer than Content-Length, FastApi

class NothingToRespondException(Exception):
    def __init__(self, stage: str):
        self.detail = "No answer to return while executing " + stage + ", try adjusting threshold"
        
async def nothing_to_respond_exception_handler(request: Request, exc: NothingToRespondException):
    return JSONResponse(
        status_code=404,
        content={"message": exc.detail},
    )

Python fastapi 의 exceptions handler를 만들 때
자꾸

RuntimeError: Response content longer than Content-Length in Uvicorn, for status codes without body

이딴 애러를 내서 봤더니,

Status CODE 200대, ex.204 ...
는 에러로 취급되지 않아서 에러메시지를 못쓰게 되어 있더라.

404 code로 바꿔 해결