X-Frame-Options, X-Content-Type-Options, Referrer-Policy at server
scope on _, forge, and matrix vhosts. HSTS added when TLS is active.
nginx inheritance rule: locations with their own add_header (CORS API
endpoints like /.well-known/matrix/client, /_matrix/) are unaffected —
they already carry the headers they need. HTML-serving and proxy
locations pick the security headers up automatically.
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