add_header X-Content-Type-Options "nosniff" always;
add_header Referrer-Policy "no-referrer" always;
add_header X-Frame-Options "DENY" always;
add_header Permissions-Policy "camera=(), microphone=(), geolocation=()" always;
add_header Content-Security-Policy "default-src 'none'; img-src 'self'; style-src 'self'; base-uri 'none'; form-action 'none'; frame-ancestors 'none'; upgrade-insecure-requests" always;
add_header Strict-Transport-Security "max-age=86400" always;