string(243) "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%A6%82%E4%BD%95%E6%B8%85%E7%90%86 => Failed to connect to 101.89.159.206 port 38075: Connection refused"
cad文件太大如何清理
