string(303) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E4%B8%80%E5%BB%BA%E6%B0%B4%E5%88%A9%E8%AF%BE%E6%9C%AC%E5%90%8E%E9%9D%A2%E7%9A%84%E6%A1%88%E4%BE%8B%E8%83%BD%E8%80%83%E5%88%B0%E5%90%97 => Failed to connect to 101.89.117.144 port 38056: Connection refused"
一建水利课本后面的案例能考到吗
