It's a .well-known way to serve additional metadata for a website. https://en.wikipedia.org/wiki/List_of_/.well-known/_services_offered_by_webservers https://e

It's a .well-known way to serve additional metadata for a website. https://en.wikipedia.org/wiki/List_of_/.well-known/_services_offered_by_webservers https://en.wikipedia.org/wiki/List_of_/.well-known/_services... Better link from stedaniels further in comments: https://ma.ttias.be/well-known-directory-webservers-aka-rfc-5785/ https://ma.ttias.be/well-known-directory-webservers-aka-rfc-...