HTun 允许你把数据封装在HTTP/1.1 或者HTTP/1.0协议中再通过一个 HTTP proxy 的80端口出去,建立两台机器之间建立IP VPN连接,通过这样的办法,可以成功避免防火墙的封锁。-HTun allows you to package the data in HTTP/1.1 or HTTP/1.0 protocol and through a port 80 HTTP proxy out to establish IP VPN between two machines connected through this approach, can successfully avoid the firewall blocking.