It is possible to use SSL/HTTPS on Cheyenne Web Server (http://cheyenne-server.org/) using stunnel or nginx:
All you need to do is setup stunnel to listen on 443, and redirect decrypted traffic to a local port that cheyenne is listening to.
You need stunnel to forward to a different port number which you will know will be ssl traffic. But that port is not open to the world. Only 443 and 80 are.
Here are some useful links:
https://www.stunnel.org/
https://www.stunnel.org/static/stunnel.html
http://www.rebol.org/aga-display-posts.r?post=r3wp495x273
http://www.rejetto.com/wiki/index.php?title=HFS:_Secure_your_server