string(241) "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%A4%AA%E5%A4%A7%E6%B8%85%E7%90%86%E4%B8%8D%E6%8E%89 => Failed to connect to 14.18.117.71 port 38220: Connection refused"
cad文件太大清理不掉
