string(250) "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%97%A0%E6%B3%95%E6%89%93%E5%BC%80%E6%80%8E%E4%B9%88%E5%8A%9E => Failed to connect to 14.116.215.7 port 38230: Connection refused"
cad突然无法打开怎么办
