string(321) "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%E5%90%84%E7%A7%8D%E6%96%B9%E6%B3%95%E9%83%BD%E6%97%A0%E6%B3%95%E6%B8%85%E7%90%86%E6%80%8E%E4%B9%88%E5%9B%9E%E4%BA%8B => Failed to connect to 14.18.46.51 port 38044: Connection refused"
cad文件太大各种方法都无法清理怎么回事
