string(247) "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%E7%9C%8B%E8%AE%B2%E4%B9%89%E6%9C%89%E6%95%88%E6%9E%9C%E5%90%97 => Failed to connect to 14.18.117.71 port 38093: Connection refused"
二建看讲义有效果吗
