如何搭建一个现成的https到http网关？

I have an HTTP server which is in our internal network and accessible only from inside it. I would like to put another server that would listen to an HTTPS port accessible from outside, and forward the requests to that HTTP server (and send back the responses via HTTPS). I know that there are several ways to do this with some programming involved (and I myself made a temporary solution with Tomcat and a very simple servlet I wrote), but is there a way to do the same just plugging parts already made (like Apache + modules)?I have an HTTP server which is in our internal