1QuickSI let me give you a few notes on my own experiences with mod_gzip ( from
http://www.remotecommunications.com/apache/mod_gzip/)
In testing on a RH6.2 server (my own kernel) Apache 1.3.17/mod_gzip/mod_perl 1.25/mod_php/mod_ssl:
HTML squished 80 to 85%
.jpg is already compressed. Waste of recources enabling for .jpg
.gif will squish but in Netscape it made a dead image. Ie worked fine.
.cgi stuff works well also, except the UBB.

The pages load quick and fast but I had a problem with any pages involving a refresh. In other words after you post you get the refresh screen that should then bring you back to your post. It didn't refresh with mod_gzip enabled for .cgi pages. Don't know why.
.php is iffy in my book. I tried with and without dechunking. Some pages worked, some gave me a doc contains no data error.
I'll be honest I did not have the time to fool around with it and figure out why the above behaviours were displayed. I also did not have the time to config around certain browsers. I also was using the version previous to the current version when I was testing. Maybe some of it is fixed now in this newer release.
That said I have been running the latest version, enabled for the html pages only, on Infopop.com for a week with no complaints or comments at all. Too soon to know accurately if it made any real impact on bandwidth.
edit - have not tried mod_gzip yet with SSL enabled.
[ June 12, 2001 09:33 PM: Message edited by: Ultimate navaho ]