code: def get_url(self):
          
          # construct the URL from runtime's FILESYSTEM location param
          # plus what we know about the location of repository / assetContents
          # have to get repositoryId from the asset?
          # return self._payload.get_url()
          url = '/repository/repositories/{0}/assets/{1}/contents/{2}/stream'.format(self._my_map['assignedRepositoryIds'][0],
                                                                                     str(self.get_asset_id()),
                                                                                     str(self.get_id()))
  
          if 'url_hostname' in self._config_map:
              url_hostname = self._config_map['url_hostname']
              return '{0}{1}'.format(url_hostname, url)
  
          return url
docs: Gets the URL associated with this content for web-based retrieval.
  
          return: (string) - the url for this data
          raise:  IllegalState - ``has_url()`` is ``false``
          *compliance: mandatory -- This method must be implemented.*