server {
  listen 80;
  server_name _;

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

  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 "camera=(), microphone=(), geolocation=()" always;
  add_header Content-Security-Policy "default-src 'self'; script-src 'self'; style-src 'self' 'unsafe-inline'; font-src 'self'; img-src 'self' blob: data:; connect-src 'self' http://localhost:8081 http://127.0.0.1:8081; base-uri 'self'; form-action 'self'; frame-ancestors 'none'" always;

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

  location ~* \.(js|css|png|jpg|jpeg|gif|svg|webp|ico)$ {
    expires 7d;
    add_header Cache-Control "public, immutable";
    try_files $uri =404;
  }
}