string(240) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=cad%E6%96%87%E4%BB%B6%E5%8D%A0%E7%94%A8%E7%A9%BA%E9%97%B4%E5%A4%A7%E5%90%97 => Failed to connect to 14.18.46.51 port 38206: Connection refused"
cad文件占用空间大吗
