string(241) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=dns%E8%AE%BE%E7%BD%AE%E5%93%AA%E4%B8%AA%E6%9C%80%E5%A5%BD%E6%9C%80%E5%BF%AB => Failed to connect to 61.171.74.35 port 38041: Connection refused"
dns设置哪个最好最快
