(Speculation) Fetches content information for a given vendor, model, and ID as chunks.

        This method might map to:
        https://github.com/exosite/docs/tree/master/provision#get---get-content-blob-1,
        but seems to be missing serial number.

        Args:
            cik: The CIK for the device
            vendor: The name of the vendor
            model:
            contentid: The ID used to name the entity bucket

def content_download(self, cik, vendor, model, contentid):
        """(Speculation) Fetches content information for a given vendor, model, and ID as chunks.

        This method might map to:
        https://github.com/exosite/docs/tree/master/provision#get---get-content-blob-1,
        but seems to be missing serial number.

        Args:
            cik: The CIK for the device
            vendor: The name of the vendor
            model:
            contentid: The ID used to name the entity bucket
        """
        data = urlencode({'vendor': vendor,
                          'model': model,
                          'id': contentid})
        headers = {"Accept": "*"}
        return self._request(PROVISION_DOWNLOAD,
                             cik, data, 'GET', True, headers)