code: def fetch_cdn_data(self, container):
          
          name = utils.get_name(container)
          uri = "/%s" % name
          try:
              resp, resp_body = self.api.cdn_request(uri, "HEAD")
          except exc.NotCDNEnabled:
              return {}
          return resp.headers
docs: Returns a dict containing the CDN information for the specified
          container. If the container is not CDN-enabled, returns an empty dict.