Apache Server Info

You can use mod_info in Apache to display specific details regarding the installation of Apache.

Configuration
<Location /server-info>
    SetHandler server-info
    Order deny,allow
    Deny from all
    Allow from 1.2.3.4
</Location>
Gentoo

Add -D INFO to APACHE2_OPTS in /etc/conf.d/apache2

Apache MPM Configurations