string(274) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E4%B8%AD%E7%BA%A7%E7%BB%8F%E6%B5%8E%E5%9F%BA%E7%A1%80%E7%9F%A5%E8%AF%86%E4%B8%89%E8%89%B2%E7%AC%94%E8%AE%B0 => Failed to connect to 14.18.117.71 port 38220: Connection refused"
中级经济基础知识三色笔记
