Determining if request was made via HTTPS

Hi all,

I'm writing an Apache module that needs to determine if a request came in
via HTTP or HTTPS. Does mod_ssl provide some interface that other modules
can use to determine this? Clearly, mod_cgi figures this out somehow,
because it correctly sets the "HTTPS" environment variable, but I don't
understand how it figures this out. I can't find anything in the request
record that would let me tell the difference between an incoming HTTPS
request and an HTTP one.

Any help would be appreciated. Thanks!
---
Ken Kittlitz
Vice-President, Javien Canada Inc.
http://www.javien.com

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