nginx.conf

server {
    listen 80;
    server_name localhost;
    root /usr/share/nginx/html;
    index index.html;

    # --- Security headers ---
    add_header X-Content-Type-Options "nosniff" always;
    add_header X-Frame-Options "DENY" always;
    add_header Referrer-Policy "strict-origin-when-cross-origin" always;
    add_header Permissions-Policy "geolocation=(), microphone=(), camera=()" always;
    add_header Content-Security-Policy "default-src 'self'; script-src 'self'; style-src 'self' 'unsafe-inline'; img-src 'self' data: https:; font-src 'self' data:; connect-src 'self'; frame-ancestors 'none'; base-uri 'self'; form-action 'self'; object-src 'none'" always;
    add_header Strict-Transport-Security "max-age=31536000; includeSubDomains" always;

    # --- Gzip compression ---
    gzip on;
    gzip_vary on;
    gzip_proxied any;
    gzip_comp_level 6;
    gzip_min_length 256;
    gzip_types
        text/plain
        text/css
        text/xml
        application/json
        application/javascript
        application/xml+rss
        application/atom+xml
        image/svg+xml;

    # --- SPA fallback ---
    location / {
        try_files $uri $uri/ /index.html;
    }

    # --- Long-lived caching for hashed build assets (outputHashing: all) ---
    # `expires` (not add_header) so server-level security headers still inherit here.
    location ~* \.(?:js|css|svg|woff2?)$ {
        expires 1y;
        access_log off;
    }

    # --- index.html must always revalidate so new deploys are picked up ---
    location = /index.html {
        expires 0;
    }

    # --- API reverse proxy ---
    location /api/ {
        proxy_pass http://backend:3000;
        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;
    }
}