string(256) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%93%AA%E4%BA%9B%E5%9C%B0%E6%96%B9%E6%98%AF%E9%9D%A9%E5%91%BD%E6%A0%B9%E6%8D%AE%E5%9C%B0 => Failed to connect to 14.18.117.71 port 38133: Connection refused"
哪些地方是革命根据地
