“A man is not dead while his name is still spoken.”
As a way to preserve the memory of Sir Terry Pratchett, the users of the SubReddit for the Discworld series came up with the idea behind the X-Clacks-Overhead HTTP Header. It allows web authors to silently commemorate someone through the use of a non-invasive header that can be transmitted from server to server, or server to client without operational interference.
You would only know the header is present if you analysed the transmission headers of your content requests on web sites serving the header.
i decided to honor multiple people with this, each name picked at random and served on each request through a small PHP script:
see it yourself:
curl -s https://girlonthemoon.xyz --head | grep clacks