IBM HTTP Server - GNU Terry Pratchett

I'm probably late to the meme party, but this is what Sir Terry would've wanted: -

achieved with this: -

LoadModule headers_module modules/mod_headers.so
<IfModule headers_module>
header set X-Clacks-Overhead "GNU Terry Pratchett"
</IfModule>

in /opt/IBM/HTTPServer/conf/httpd.conf.

With thanks to this post: -

GNU Terry Pratchett