server {
    listen 80;
    server_name api.example.com;

    location / {
        proxy_pass http://backend:3000;

        # Forward original headers
        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;

        # Timeouts
        proxy_connect_timeout 60s;
        proxy_send_timeout 60s;
        proxy_read_timeout 60s;

        # Buffering
        proxy_buffering on;
        proxy_buffer_size 128k;
        proxy_buffers 4 256k;
    }
}