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Re: Fetch groups

From: Ian Hickson <ian@hixie.ch>
Date: Tue, 25 Jun 2013 18:35:45 +0000 (UTC)
To: Anne van Kesteren <annevk@annevk.nl>
cc: Boris Zbarsky <bzbarsky@mit.edu>, Adam Barth <w3c@adambarth.com>, Edward O'Connor <eoconnor@apple.com>, Travis Leithead <Travis.Leithead@microsoft.com>, www-archive <www-archive@w3.org>
Message-ID: <Pine.LNX.4.64.1306251831460.11139@ps20323.dreamhostps.com>
On Tue, 25 Jun 2013, Anne van Kesteren wrote:
> 1) We cannot directly share the Document object with individual fetches 
> as long term we might want fetching to be happen off-the-main-thread. 
> For workers this is already the case.

As long as it's not exposed to script, we probably can. Workers, for 
instance, keep track of Documents internally.

> 2) A fetch group would allow for shared state among a bunch of fetches, 
> such as origin, referrer, and CSP policy.

That state is currently managed via a Document, no?

> 3) If we merge CSP and Fetch by having a CSP parameter to fetch, we can 
> handle the load images directly from disk if the URL has been fetched 
> for the Document before via this fetch group. HTML, CSS, SVG, et al 
> would fetch images using the 'image-src' CSP parameter and the rest 
> would follow automatically.

Note that the "list of available images" is allowed to be copied from doc 
to doc, it's not really scoped to the "fetch group".

> 4) Lifetime of a Document becomes somewhat more explicit than "fetches 
> associated with this Document" although this seems one of the lesser 
> benefits.

Not sure I follow this.

> Now if we don't want to have fetch groups we need something for the 
> following instead:
> 1) A way to load images without hitting the network for known URLs that 
> can be used across HTML, CSS, SVG, et al.
> 2) An easy way to identify both the CSP policy in effect for a 
> particular fetch operation (the Content-Security-Policy header and its 
> reporting friend) as well as the CSP type (e.g. 'image-src').

I'd just use the Document as the key.

Ian Hickson               U+1047E                )\._.,--....,'``.    fL
http://ln.hixie.ch/       U+263A                /,   _.. \   _\  ;`._ ,.
Things that are impossible just take longer.   `._.-(,_..'--(,_..'`-.;.'
Received on Tuesday, 25 June 2013 18:36:08 UTC

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