erver {
    listen 80;
    listen [::]:80;

    auth_basic "";
    auth_basic_user_file /etc/nginx/htpasswd/htpasswd_scan;

    location /scan {
        content_by_lua_block {
            os.execute("scanimage --format jpeg >/srv/scans/image.jpg")
            ngx.redirect("/scan/image.jpg")
        }
    }

    location /scan/image.jpg {
        alias /srv/scans/image.jpg;
    }

}