string(288) "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 => Failed to connect to 101.89.159.206 port 38187: Connection refused"
cad文件太大各种方法都无法清理
