string(256) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=wifi%E5%B7%B2%E8%BF%9E%E6%8E%A5%E4%B8%8D%E5%8F%AF%E4%B8%8A%E7%BD%91dns%E5%BC%82%E5%B8%B8 => Failed to connect to 101.89.117.144 port 38005: Connection refused"
wifi已连接不可上网dns异常
