def get_response_headers(self, *args, **kwargs):
        """
        A convenience method for obtaining the headers that were sent from the
        S3 server.

        The AWS S3 API depends upon setting headers. This method is used by the
        head_object API call for getting a S3 object's metadata.
        """
        if self.response_headers:
            return self._unpack_headers(self.response_headers)