server {
  listen 80;
  server_name _;
  server_tokens off;

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

  add_header Content-Security-Policy "default-src 'self'; script-src 'self'; style-src 'self'; img-src 'self' data: blob:; font-src 'self' data:; connect-src 'self'; frame-ancestors 'self'; base-uri 'self'; form-action 'self'" always;
  add_header Referrer-Policy "strict-origin-when-cross-origin" always;
  add_header X-Content-Type-Options "nosniff" always;
  add_header X-Frame-Options "SAMEORIGIN" always;
  add_header Permissions-Policy "camera=(), microphone=(), geolocation=()" always;

  location = /healthz {
    access_log off;
    add_header Content-Type text/plain;
    return 200 "ok\n";
  }

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