events {
  worker_connections 128;
}

http {
  upstream switchboard {
    server switchboard-1:80;
    server switchboard-2:80;
  }

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

  server {
    listen 80;

    location / {
      proxy_pass http://switchboard;
      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;
    }

    # WebSocket endpoint
    location /ws {
      proxy_pass http://switchboard;
      proxy_http_version 1.1;
      proxy_set_header Upgrade $http_upgrade;
      proxy_set_header Connection $connection_upgrade;
      proxy_set_header Host $host;
      proxy_set_header X-Real-IP $remote_addr;
      proxy_read_timeout 86400s;
    }
  }
}