add_header Strict-Transport-Security "max-age=63072000; includeSubDomains; preload" always;
add_header X-Content-Type-Options "nosniff" always;
add_header Referrer-Policy "no-referrer" always;
add_header Cross-Origin-Opener-Policy "same-origin" always;
add_header Cross-Origin-Embedder-Policy "require-corp" always;
add_header Origin-Agent-Cluster "?1" always;

# obsolete, unsafe and replaced with strong Content-Security-Policy
add_header X-XSS-Protection "0" always;