mod_sphinx is an Apache module which intercepts output bound for the
client, whether it be from files served by the same Web server, files
sent via reverse proxying, or files delivered by transparent forward
proxying (outbound proxying, as in your browser's proxy setting). It
opens the text and replaces a word with another word or phrase. When in
regular proxy mode, it cannot modify SSL content since Apache cannot
decrypt that (it would be a protocol violation).
