One of my users, got such request from Letsencrypt:
GET /.well-known/acme-challenge/-HvFFScum7ClEJgg4jjmC38aUrLCxF9UGXh7Gchkj-k HTTP/1.0
Host: acme.frontend
Connection: close
User-Agent: Mozilla/5.0 (compatible; Let's Encrypt validation server; +https://www.letsencrypt.org)
Accept: */*
Accept-Encoding: gzip
The host is Host: acme.frontend
.
Does any one know where this request was coming from ?
Thanks.