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The CSP 'referrer' directive allows site owners to set a Referrer Policy (https://w3c.github.io/webappsec-referrer-policy/) for their page from an HTTP header. The 'referrer' directive has been removed from the spec and replaced with the Referrer-Policy header.
This feature has very low usage (<= 0.0001% of page loads) and has been obviated by the Referrer-Policy header, which will ship in M56.
Firefox is the only other browser that supports this CSP directive. Thus developers who are using this feature have already accepted the risk that the referrer policy will not be applied to their page for all their users.
Alternative implementation suggestion for web developers
The Referrer-Policy header or the <meta name="referrer"> tag.
Usage information from UseCounter
<= 0.0001% of page loads
Entry on the feature dashboard
There doesn't appear to be a chromestatus entry for CSP 'referrer', but the other Referrer Policy entries are https://www.chromestatus.com/feature/5639972996513792 and https://www.chromestatus.com/feature/5126747842412544
Requesting approval to remove too?
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Emily,Since the intent is to notify developer's of changes, could you please create a separate status entry for this. Do you have an OWP tracking bug?
On Mon, Oct 24, 2016 at 9:43 AM, Emily Stark <est...@chromium.org> wrote:
Thanks.Are you deprecating and removing in a single version or is there going to be a deprecation period?