simple-forum/acme_http

location ~ ^/(.well-known/acme-challenge/.*)$ {
  proxy_pass http://127.0.0.1:9999/$1;
  proxy_set_header X-Real-IP $remote_addr;
  proxy_set_header Host $http_host;
  proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
}