nginx.conf

events {
    worker_connections 1024;
}

http {
    # Security headers
    add_header X-Frame-Options "SAMEORIGIN";
    add_header X-XSS-Protection "1; mode=block";
    add_header X-Content-Type-Options "nosniff";
    add_header Referrer-Policy "no-referrer-when-downgrade";
    add_header Content-Security-Policy "default-src 'self';";

    # SSL configuration
    ssl_protocols TLSv1.2 TLSv1.3;
    ssl_prefer_server_ciphers on;
    ssl_ciphers ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384;

    # Proxy settings
    server {
        listen 80;
        server_name localhost;

        location / {
            return 404;
        }

        location /api/ {
            proxy_pass http://localhost:3000;
            proxy_http_version 1.1;
            proxy_set_header Upgrade $http_upgrade;
            proxy_set_header Connection 'upgrade';
            proxy_set_header Host $host;
            proxy_cache_bypass $http_upgrade;
            proxy_set_header X-Real-IP $remote_addr;
            proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
            
            # Rate limiting
            limit_req zone=api burst=10 nodelay;
            limit_req_zone $binary_remote_addr zone=api:10m rate=5r/s;
        }

        # Health check endpoint
        location /health {
            proxy_pass http://localhost:3000/health;
            proxy_http_version 1.1;
            proxy_set_header Host $host;
            proxy_cache_bypass $http_upgrade;
        }
    }
}