For now SSL It! extension uses dns method to issue/renew Let's Encrypt certificate. How can I configure it to use web server method to issue certificates?
DNS challenge is used to issue wildcard certificates. HTTP challenge - when securing only a domain (without wildcard). This cannot be changed since Let's Encrypt does not allow using the HTTP challenge for wildcard - Challenge Types - Let's Encrypt - Free SSL/TLS Certificates
Let’s Encrypt doesn’t let you use this challenge(HTTP-01 challenge) to issue wildcard certificates.