string(279) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E7%A7%81%E4%BA%BAdns%E6%8F%90%E4%BE%9B%E5%95%86%E4%B8%BB%E6%9C%BA%E5%90%8D%E6%97%A0%E6%B3%95%E8%BF%9E%E6%8E%A5 => Failed to connect to 101.89.143.195 port 38109: Connection refused"
私人dns提供商主机名无法连接
