string(278) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=2021%E7%99%BE%E5%BA%A6%E4%BA%91%E6%99%BA%E5%B3%B0%E4%BC%9A%E6%99%BA%E6%85%A7%E5%9F%8E%E5%B8%82%E4%B8%93%E9%A2%98 => Failed to connect to 14.18.117.71 port 38041: Connection refused"
2021百度云智峰会智慧城市专题
