提供了一个在外网能够安全的访问内网Web主机，还能捕获所有请求的http内容，方便调试，甚至还支持tcp层端口映射。支持Mac OS X，Linux，Windows平台。(It provides a secure access to the Web host in the intranet, and captures all the requested HTTP content, facilitates debugging, and even supports the TCP layer port mapping. Support Mac OS X, Linux, Windows platform)