string(232) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=etf%E6%9C%89%E6%B2%A1%E6%9C%89%E4%B8%8B%E6%8A%98%E9%A3%8E%E9%99%A9 => Failed to connect to 14.18.117.71 port 38220: Connection refused"
etf有没有下折风险
