string(249) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%9B%BD%E5%86%85%E6%9C%80%E5%BF%AB%E7%9A%84dns%E5%A6%82%E4%BD%95%E8%AE%BE%E7%BD%AE => Failed to connect to 14.18.46.51 port 38206: Connection refused"
国内最快的dns如何设置
