def __init__(
        self,
        length: int | None = None,
        units: str = "bytes",
        description: str | None = None,
        response: Response | None = None,
    ) -> None:
        """Takes an optional `Content-Range` header value based on ``length``
        parameter.
        """
        super().__init__(description=description, response=response)
        self.length = length
        self.units = units
Takes an optional `Content-Range` header value based on ``length``
        parameter.
        
src/werkzeug/exceptions.py