string(273) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=cad%E6%80%8E%E6%A0%B7%E6%B8%85%E7%90%86%E6%96%87%E4%BB%B6%2C%E4%BD%BF%E6%96%87%E4%BB%B6%E5%8F%98%E5%B0%8F => Failed to connect to 125.88.227.171 port 38114: Connection refused"
cad怎样清理文件,使文件变小
