string(243) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=cad%E7%AA%81%E7%84%B6%E6%89%93%E4%B8%8D%E5%BC%80%E6%80%8E%E4%B9%88%E5%8A%9E => Failed to connect to 125.88.227.171 port 38114: Connection refused"
cad突然打不开怎么办
