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Deprecation of "referral" directive #13838
The MAINT_4_4_15 branch is no longer maintained, so it makes no sense to merge changes there.
The supported versions already include the Referrer-Policy header:
And the referer policy is only included in X-Content-Security-Policy, which should be parsed by browser not compliant with current specification:
The compliant browsers should use Content-Security-Policy header: