string(236) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E8%81%94%E6%83%B3b50-30%E8%AE%BE%E7%BD%AEu%E7%9B%98%E5%90%AF%E5%8A%A8 => Failed to connect to 14.18.117.71 port 38164: Connection refused"
联想b50-30设置u盘启动
