string(238) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E9%93%B6%E8%A1%8C%E5%88%A9%E7%8E%87%E8%AE%A1%E7%AE%97%E8%A7%84%E5%88%99 => Failed to connect to 14.18.117.71 port 38069: Connection refused"
银行利率计算规则
