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Re: [CSP] Clarifications regarding the HTTP LINK Header

From: Mike West <mkwst@google.com>
Date: Fri, 16 Jan 2015 16:49:10 +0100
Message-ID: <CAKXHy=dEGrwEj4Cqb11=j5K=WXNR1C4LzJxuDHR9POCHCAmmtA@mail.gmail.com>
To: Anne van Kesteren <annevk@annevk.nl>
Cc: Deian Stefan <deian@cs.stanford.edu>, Brian Smith <brian@briansmith.org>, Brad Hill <hillbrad@fb.com>, Ilya Grigorik <ilya@igvita.com>, Boris Zbarsky <bzbarsky@mit.edu>, "public-webappsec@w3.org" <public-webappsec@w3.org>
I've attempted to deal with these questions in
(which is more readably presented at

In particular, note the "Processing Complications" section at



Mike West <mkwst@google.com>, @mikewest

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On Tue, Nov 18, 2014 at 10:11 AM, Anne van Kesteren <annevk@annevk.nl>

> On Tue, Nov 18, 2014 at 3:52 AM, Deian Stefan <deian@cs.stanford.edu>
> wrote:
> > Brian Smith <brian@briansmith.org> writes:
> >> Devdatta brought up the point last week that the CSP drafts do not say
> >> that the browser MUST NOT issue the HTTP (or whatever) request when
> >> they block a fetch due to CSP violation. That is, it is perfectly
> >> legal to make the HTTP request (optionally caching it) and then ignore
> >> it, according to the current wording in the CSP drafts. However, I
> >> think this is a bug that should be fixed.
> >
> > +1 I think this should be fixed as well.
> This would be fixed by a Fetch-based rewrite, that's planned for
> CSP3... Though note that due to service workers CSP will likely not be
> able to prevent all fetches going forward (since service workers have
> their own policy) and that therefore we're looking into blocking on
> certain responses as well.
> --
> https://annevankesteren.nl/
Received on Friday, 16 January 2015 15:49:58 UTC

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