Probably a joke. They are using Nginx, and you can easily add a custom header using the add_header directive[1] in the Nginx config. e.g. add_header "X-Powered

Probably a joke. They are using Nginx, and you can easily add a custom header using the add_header directive[1] in the Nginx config. e.g. add_header "X-Powered-By" "Food"; [1]http://wiki.nginx.org/HttpHeadersModule#add_header http://wiki.nginx.org/HttpHeadersModule#add_header I sometimes throw in these kind of headers for fun on my own sites.