nginx.conf

# nginx.conf
server {
    listen 80;
    
    root /usr/share/nginx/html;
    index index.html;

    # Enable gzip compression
    gzip on;
    gzip_types text/plain text/css application/json application/javascript text/xml application/xml application/xml+rss text/javascript;

    # Security headers
    add_header X-Content-Type-Options "nosniff" always;
    add_header X-Frame-Options "SAMEORIGIN" always;
    add_header X-XSS-Protection "1; mode=block" always;
    add_header Referrer-Policy "strict-origin-when-cross-origin" always;

    # Static content with cache control
    location ~* \.(css|js|jpg|jpeg|png|gif|ico|svg|woff|woff2|ttf|eot)$ {
        access_log off;
        expires 30d;
        add_header Cache-Control "public, max-age=2592000";
    }

    # HTML files - no caching
    location ~* \.html$ {
        add_header Cache-Control "no-store, no-cache, must-revalidate";
    }

    # API forwarding
    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_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;
        proxy_cache_bypass $http_upgrade;
    }

    # Handle static files and SPA routing
    location / {
        try_files $uri $uri/ /index.html;
    }

    # Custom error pages
    error_page 502 /error/502.html;
    location /error/ {
        internal;
    }
}