string(260) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=inux%E8%B7%A8%E6%9C%8D%E5%8A%A1%E5%99%A8%E4%BC%A0%E6%96%87%E4%BB%B6%E7%9A%84%E5%91%BD%E4%BB%A4 => Failed to connect to 14.18.117.71 port 38220: Connection refused"
inux跨服务器传文件的命令
