string(256) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E4%BB%80%E4%B9%88%E5%8F%AB%E5%81%9A%E7%9F%AD%E8%B7%AF%E5%92%8C%E6%96%AD%E8%B7%AF%E5%91%A2 => Failed to connect to 14.116.215.7 port 38230: Connection refused"
什么叫做短路和断路呢
