code: func fetchConfigFile(c context.Context, path string) (string, *config.Meta, error) {
  	configSet := cfgclient.CurrentServiceConfigSet(c)
  	logging.Infof(c, "Reading %q from config set %q", path, configSet)
  	c, cancelFunc := context.WithTimeout(c, 29*time.Second) // URL fetch deadline
  	defer cancelFunc()
  
  	var (
  		content string
  		meta    config.Meta
  	)
  	if err := cfgclient.Get(c, cfgclient.AsService, configSet, path, cfgclient.String(&content), &meta); err != nil {
  		return "", nil, err
  	}
  	return content, &meta, nil
  }
docs: ////////////////////////////////////////////////////////////////////////////////
  // fetchConfigFile fetches a file from this services' config set.