location / {

  # Force usage of https
  if ($scheme = http) {
    rewrite ^ https://$server_name$request_uri? permanent;
  }

  client_max_body_size 100M;

  proxy_pass http://127.0.0.1:8123;
  proxy_http_version 1.1;
  proxy_set_header Upgrade $http_upgrade;
  proxy_set_header Connection "Upgrade";

  # preserve client IP
  proxy_set_header X-Forwarded-For $remote_addr;
}