map $http_upgrade $connection_upgrade {
  default upgrade;
  '' close;
}

server {
  listen 80;
  server_name _;

  client_max_body_size 20m;

  location / {
    proxy_pass http://builder:5173;
    proxy_http_version 1.1;

    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-Forwarded-Proto $scheme;

    # Vite HMR/WebSocket
    proxy_set_header Upgrade $http_upgrade;
    proxy_set_header Connection $connection_upgrade;
  }
}
