nginx.conf

server {
  listen 80;
  server_name _;

  root /usr/share/nginx/html;
  index index.html;

  gzip on;
  gzip_types text/plain application/javascript application/x-javascript text/javascript text/xml text/css application/json;

  # Security headers
  add_header X-Frame-Options "DENY" always;
  add_header X-Content-Type-Options "nosniff" always;
  add_header Referrer-Policy "strict-origin-when-cross-origin" always;
  add_header Permissions-Policy "geolocation=(), microphone=(), camera=()" always;
  # Adjust CSP if you add external CDNs; React may require 'unsafe-inline' for styles
  add_header Content-Security-Policy "default-src 'self'; script-src 'self'; style-src 'self' 'unsafe-inline'; img-src 'self' data:; connect-src 'self' https:; font-src 'self' data:; object-src 'none'; base-uri 'self'; frame-ancestors 'none'" always;
  # HSTS is effective only over HTTPS (kept for reverse-proxy TLS setups)
  add_header Strict-Transport-Security "max-age=63072000; includeSubDomains; preload" always;

  location / {
    try_files $uri /index.html;
  }

  location /static/ {
    access_log off;
    expires 30d;
  }
}