code: def get_cdn_metadata(self, container):
          
          uri = "%s/%s" % (self.uri_base, utils.get_name(container))
          resp, resp_body = self.api.cdn_request(uri, "HEAD")
          ret = dict(resp.headers)
          # Remove non-CDN headers
          ret.pop("content-length", None)
          ret.pop("content-type", None)
          ret.pop("date", None)
          return ret
docs: Returns a dictionary containing the CDN metadata for the container. If
          the container does not exist, a NotFound exception is raised. If the
          container exists, but is not CDN-enabled, a NotCDNEnabled exception is
          raised.