string(280) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=inux%E4%B8%A4%E5%8F%B0%E6%9C%BA%E5%99%A8%E5%BF%AB%E9%80%9F%E6%8B%B7%E8%B4%9D%E5%A4%A7%E9%87%8F%E6%96%87%E4%BB%B6 => Failed to connect to 101.89.117.144 port 38076: Connection refused"
inux两台机器快速拷贝大量文件
