string(259) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%9F%BA%E9%87%91etf%E6%9C%89%E4%B8%8A%E6%8A%98%E4%B8%8B%E6%8A%98%E9%A3%8E%E9%99%A9%E5%90%97 => Failed to connect to 14.18.117.71 port 38041: Connection refused"
基金etf有上折下折风险吗
