During some period of time we have to use both Apache and Litespeed on one server. We need some segments of httpd.conf to be differend on each webserver but otherwise we share the same httpd.conf. I see Litespeed can't handle properly IfModule conditions for example in .htaccess files. I can put this into my .htaccess: <IfModule mod_nonexistent.c> AllowOverride All </IfModule> ...and AllowOverride should never be parsed. Apache don't pass this condition but Litespeed does! This is serious incompatibility, as Litespeed specifications says "Apache compatible .htaccess support" Thank you for help.