string(278) "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%86%85%E5%AD%98%E5%A4%AA%E5%A4%A7%E6%80%8E%E4%B9%88%E6%B8%85%E7%90%86%E7%BC%93%E5%AD%98 => Failed to connect to 101.91.112.32 port 38162: Connection refused"
cad文件内存太大怎么清理缓存
