frappe_docker/resources/core/nginx/security_headers.conf

add_header X-Frame-Options "SAMEORIGIN" always;
add_header Strict-Transport-Security "max-age=63072000; includeSubDomains; preload" always;
add_header X-Content-Type-Options nosniff always;
add_header X-XSS-Protection "1; mode=block" always;
add_header Referrer-Policy "same-origin, strict-origin-when-cross-origin" always;