{% from 'states/acme/map.jinja' import acme as acme_map with context %}
server {
    listen 80;
    server_name _;
    add_header Content-Type text/plain;
    location / {
        alias {{ acme_map.webroot }};
        try_files $uri =404;
    }
}

{% from 'states/acme/map.jinja' import acme as acme_map with context %}
server {
    listen 80;
    server_name _;
    add_header Content-Type text/plain;
    location /.well-known/acme-challenge/ {
        alias {{ acme_map.webroot }};
        try_files $uri =404;
    }
}

Change path for ACME backend.
nginx: Change path for ACME backend.
