string(258) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%A4%A7%E6%95%B0%E6%8D%AE%E6%94%B6%E9%9B%86%E4%B8%8E%E5%88%86%E6%9E%90%E6%95%99%E6%9D%90 => Failed to connect to 101.89.117.144 port 38005: Connection refused"
大数据收集与分析教材
