string(231) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E4%BA%8C%E5%BB%BA%E6%A1%A5%E6%A2%81%E8%AE%A1%E7%AE%97%E9%A2%98 => Failed to connect to 125.88.227.171 port 38062: Connection refused"
二建桥梁计算题
