string(251) "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%A5%BD%E7%94%A8%E7%9A%84dns%E5%92%8C%E7%AB%AF%E5%8F%A3 => Failed to connect to 101.91.112.32 port 38195: Connection refused"
国内最好用的dns和端口
