nginx-conf.example

server {
  listen 80 default_server;
  listen [::]:80 default_server;

  location / { 
    proxy_pass  http://localhost:3000/;
    proxy_next_upstream error timeout invalid_header http_500 http_502 http_503 http_504;
    proxy_redirect off;
    proxy_buffering off;
    proxy_set_header        Host            $host;
    proxy_set_header        X-Real-IP       $remote_addr;
    proxy_set_header        X-Forwarded-For $proxy_add_x_forwarded_for;
  }

}

server {
  listen 443 ssl default_server;
  listen [::]:443 ssl default_server;

  ssl_certificate     /PATH.TO/fullchain.pem;
  ssl_certificate_key /PATH.TO/privkey.pem;

  location / { 
    proxy_pass  http://localhost:3000/;
    proxy_next_upstream error timeout invalid_header http_500 http_502 http_503 http_504;
    proxy_redirect off;
    proxy_buffering off;
    proxy_set_header        Host            $host;
    proxy_set_header        X-Real-IP       $remote_addr;
    proxy_set_header        X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_set_header        X-https         true;
  }

}