The “.well-known” directory on webservers (aka: RFC 5785)
▻https://ma.ttias.be/well-known-directory-webservers-aka-rfc-5785
I first came across the concept of the directory named ’.well-known’ when automating Let’s Encrypt, the free SSL certificate authority. It didn’t strike me as abnormal to have a validation happen via an HTTP or HTTPS GET request. Those Let’s Encrypt validation URLs usually point to site.tld/.well-known/acme-challenge/random-key.txt.
At first I thought this was just the random URL used by Let’s Encrypt, but today I learned there’s more to it. Allow me to introduce RFC-5785.