string(241) "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 => Failed to connect to 61.171.74.35 port 38041: Connection refused"
私人dns提供商主机名
