Challenge Types - Let's Encrypt
letsencrypt.org › docs › challenge-typesDec 08, 2020 · HTTP-01 challenge This is the most common challenge type today. Let’s Encrypt gives a token to your ACME client, and your ACME client puts a file on your web server at http://<YOUR_DOMAIN>/.well-known/acme-challenge/<TOKEN>. That file contains the token, plus a thumbprint of your account key.
Challenge Types - Let's Encrypt
https://letsencrypt.org/docs/challenge-types08.12.2020 · DNS-01 challenge. This challenge asks you to prove that you control the DNS for your domain name by putting a specific value in a TXT record under that domain name. It is harder to configure than HTTP-01, but can work in scenarios that HTTP-01 can’t. It also allows you to issue wildcard certificates.