I\'m evaluating the front end performance of a secure (SSL) web app here at work and I\'m wondering if it\'s possible to compress text files (html/css/javascript) over SSL.
Yes, gzip compression and Keep-Alive can be used with HTTPS/SSL. Also, browsers can cache SSL content.
This blog post has more information about tuning a web site for HTTPS/SSL:
http://blog.httpwatch.com/2009/01/15/https-performance-tuning/