server {
    listen 80;
    server_name example.com;
    
    # 1. Redirect HTTP to HTTPS
    return 301 https://$host$request_uri;
}

server {
    listen 443 ssl http2;
    server_name example.com;

    # SSL Certificates (Let's Encrypt usually handles these paths)
    ssl_certificate /etc/letsencrypt/live/example.com/fullchain.pem;
    ssl_certificate_key /etc/letsencrypt/live/example.com/privkey.pem;

    # 2. Security Headers
    # Protect against clickjacking and XSS
    add_header X-Frame-Options "SAMEORIGIN";
    add_header X-XSS-Protection "1; mode=block";
    add_header X-Content-Type-Options "nosniff";

    location / {
        # 3. Proxy to Node.js
        proxy_pass http://localhost:3000;
        
        # 4. Forward Headers
        # Critical for your app to know the real IP of the user
        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;
    }
}

gzip on;
gzip_types text/plain text/css application/json application/javascript text/xml application/xml application/xml+rss text/javascript;
gzip_min_length 1000; # Don't compress tiny files

# Define the zone (10 requests per second per IP)
limit_req_zone $binary_remote_addr zone=mylimit:10m rate=10r/s;

server {
    location /api/ {
        # Apply the limit with a small "burst" allowance
        limit_req zone=mylimit burst=20 nodelay;
        
        proxy_pass http://localhost:3000;
    }
}