DNS Keeper is a DNS proxy which works as a standalone DNS server to get correct results of foreign (walled) domains, while getting domestic results like baidu, taobao, etc. （DNS Keeper是一枚可配置两个上游服务器的DNS代理服务器，根据gfwlist规则自动判断使用境内还是境外的服务器，以在获取到正确地址的同时避免把国内部分网站解析成国外地址而导致访问过慢）