code: def path(self, which=None):
          
          base = urljoin(
              self._server_config.url + '/',
              self._meta['api_path']  # pylint:disable=no-member
          )
          if (which == 'self' or which is None) and hasattr(self, 'upload_id'):
              # pylint:disable=E1101
              return urljoin(base + '/', str(self.upload_id))
          return super(ContentUpload, self).path(which)
docs: Extend ``nailgun.entity_mixins.Entity.path``.