string(279) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%A5%BD%E7%94%A8%E7%9A%84%E7%A7%81%E4%BA%BAdns%E6%8F%90%E4%BE%9B%E5%95%86%E7%9A%84%E4%B8%BB%E6%9C%BA%E5%90%8D => Failed to connect to 101.89.166.210 port 38089: Connection refused"
好用的私人dns提供商的主机名
