string(237) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E8%81%94%E6%83%B3b520e%E4%B8%80%E4%BD%93%E6%9C%BA%E5%8D%87%E7%BA%A7cpu => Failed to connect to 14.18.117.71 port 38069: Connection refused"
联想b520e一体机升级cpu
