string(261) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=cad%E5%A6%82%E4%BD%95%E6%B8%85%E7%90%86%E6%96%87%E4%BB%B6%E4%B8%AD%E7%9A%84%E5%9E%83%E5%9C%BE => Failed to connect to 101.89.117.144 port 38076: Connection refused"
cad如何清理文件中的垃圾
