Website .well-known directory

IANA RFC8615 defines a “.well-known/” folder for web servers to put metadata fundamental to a web server’s organization, policies or contact information. Several popular files are seen under public website https://example.invalid/.well-known/ directory.

keybase.txt
verify ownership of domain for Keybase.io
security.txt
security incident contact info
dnt-policy.txt
Do Not Track Policy statement
humans.txt
author information