string(270) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=cad%E8%B6%85%E5%A4%A7%E6%96%87%E4%BB%B6%E6%B8%85%E7%90%86%E6%8C%87%E4%BB%A4%E6%98%AF%E4%BB%80%E4%B9%88 => Failed to connect to 101.89.159.206 port 38100: Connection refused"
cad超大文件清理指令是什么
