code: def content_download(self, cik, vendor, model, contentid):
          
          data = urlencode({'vendor': vendor,
                            'model': model,
                            'id': contentid})
          headers = {"Accept": "*"}
          return self._request(PROVISION_DOWNLOAD,
                               cik, data, 'GET', True, headers)
docs: (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