def _prepare_request(
        self,
        request: httpx.Request,  # noqa: ARG002
    ) -> None:
        """This method is used as a callback for mutating the `Request` object
        after it has been constructed.
        This is useful for cases where you want to add certain headers based off of
        the request properties, e.g. `url`, `method` etc.
        """
        return None
This method is used as a callback for mutating the `Request` object
        after it has been constructed.
        This is useful for cases where you want to add certain headers based off of
        the request properties, e.g. `url`, `method` etc.
        
src/anthropic/_base_client.py