def _flush_decoder(self) -> bytes:
        """
        Flushes the decoder. Should only be called if the decoder is actually
        being used.
        """
        if self._decoder:
            return self._decoder.decompress(b"") + self._decoder.flush()
        return b""

        Flushes the decoder. Should only be called if the decoder is actually
        being used.
        
src/urllib3/response.py