def close(self) -> None:
        """Close the underlying HTTPX client.

        The client will *not* be usable after this.
        """
        # If an error is thrown while constructing a client, self._client
        # may not be present
        if hasattr(self, "_client"):
            self._client.close()
Close the underlying HTTPX client.

        The client will *not* be usable after this.
        
src/anthropic/_base_client.py