secure_http_headers

add_header Strict-Transport-Security "max-age=31536000";
add_header X-Content-Type-Options "nosniff";
add_header X-Frame-Options "DENY";
add_header Referrer-Policy "no-referrer, strict-origin-when-cross-origin";
add_header Content-Security-Policy "default-src 'self'; style-src 'self' 'unsafe-inline'; font-src 'self' data:; img-src 'self' data:; object-src 'none'; frame-ancestors 'none'; form-action 'self';";