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* Set frame-ancestors in the CSP
This ensures we can't be loaded/embedded in an iframe. It also sets the
older X-Frame-Options for fallback.
* Disable MIME type sniffing
* Set Referrer-Policy
This sets the policy such that browsers will never send the Referer
header along with a request, unless it's a request to the same protocol,
host/domain and port. Basically, only send it when navigating through
our own UI, but not anything external.
The default is strict-origin-when-cross-origin when unset, which sends
the Referer header for requests unless it's going from HTTPS to HTTP
(i.e a security downgrade, hence the 'strict').
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Daenney
tobi