if meta && ret.headers
        meta[:index] = ret.headers['x-consul-index'] if ret.headers['x-consul-index']
        meta[:knownleader] = ret.headers['x-consul-knownleader'] if ret.headers['x-consul-knownleader']
        meta[:lastcontact] = ret.headers['x-consul-lastcontact'] if ret.headers['x-consul-lastcontact']
      end