string(256) "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%E5%85%AC%E8%B7%AF%E6%A1%88%E4%BE%8B%E8%80%83%E7%82%B9%E5%88%86%E6%9E%90 => Failed to connect to 14.18.117.71 port 38133: Connection refused"
二建公路案例考点分析
