Re: [whatwg/fetch] should VARY be a cors-safelisted header? (Issue #1365) from Anne van Kesteren on 2021-12-03 (public-webapps-github@w3.org from December 2021)

From: Anne van Kesteren <notifications@github.com>
Date: Fri, 03 Dec 2021 03:54:04 -0800
To: whatwg/fetch <fetch@noreply.github.com>
Cc: Subscribed <subscribed@noreply.github.com>
Message-ID: <whatwg/fetch/issues/1365/985458518@github.com>

The main reason we safelist response headers is because they could contain confidential information and the variety of teams working on an application might overlook this.

If we always expose `Vary` this could lead to exposure of confidential request header names. This seems quite minor, but making changes to the same-origin policy is always tricky. Is `Vary` very important in practice for the Cache API?

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Received on Friday, 3 December 2021 11:54:17 UTC