Fixed #31232 -- Changed default SECURE_REFERRER_POLICY to 'same-origin'.
PR #12419 ↗ · django/django · · merged Feb 5, 2020 · +24−2 · base 7fa1a93c6c81
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what a new run launched now would send
Add secure default SECURE_REFERRER_POLICY / Referrer-policy header
Description
#29406 added the ability for the SECURE_REFERRER_POLICY setting to set Referrer-Policy, released in Django 3.0.
I propose we change the default for this to "same-origin" to make Django applications leak less information to third party sites.
The main risk of breakage here would be linked websites breaking, if they depend on verification through the Referer header. This is a pretty fragile technique since it can be spoofed.
Documentation: https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Referrer-Policy
The MDN support grid is out of date: https://caniuse.com/#search=Referrer-Policy
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