server {
    listen 8080;
    server_name localhost;
    root /usr/share/nginx/html;
    index index.html;

    # Security Headers
    server_tokens off;
    add_header X-Frame-Options "SAMEORIGIN" always;
    add_header X-XSS-Protection "1; mode=block" always;
    add_header X-Content-Type-Options "nosniff" always;
    add_header Referrer-Policy "no-referrer-when-downgrade" always;
    add_header Content-Security-Policy "default-src 'self' http: https: data: blob: 'unsafe-inline' 'unsafe-eval' https://images.unsplash.com https://canina.de;" always;

    # Support for SPA routing
    location / {
        try_files $uri $uri/ /index.html;
    }

    # Proxy API requests to backend
    location /api {
        proxy_pass http://backend: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;
    }
}