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Re: [XHR] support for streaming data

From: Ian Hickson <ian@hixie.ch>
Date: Thu, 18 Aug 2011 22:33:01 +0000 (UTC)
To: Jonas Sicking <jonas@sicking.cc>
cc: Chris Rogers <crogers@google.com>, Webapps WG <public-webapps@w3.org>
Message-ID: <Pine.LNX.4.64.1108182232310.24216@ps20323.dreamhostps.com>
On Thu, 18 Aug 2011, Jonas Sicking wrote:
> On Thu, Aug 18, 2011 at 1:16 PM, Ian Hickson <ian@hixie.ch> wrote:
> > On Wed, 17 Aug 2011, Chris Rogers wrote:
> >>
> >> Also, it would be good to get Ian's opinion about this since he's 
> >> working on similar stuff with Web Sockets.
> >
> > Right now WebSockets only works with complete messages, there's no 
> > streaming support. I suspect that if we add streaming support to the 
> > protocol and the API, it'll be exposed as some sort of Stream object, 
> > which would then have a way to get the data out of it in chunked form, 
> > maybe a growing list of ArrayBuffers or something. I haven't looked at 
> > it in detail yet.
> >
> > There would probably be some relationship to MediaStream, too; roc may 
> > have an opinion on this topic, as he has spoken about it before.
> 
> What we're talking about here isn't really "streaming" as much as 
> "chunked". The equivalent feature would be to be able to incrementally 
> get data as a large websocket message was delivered.
> 
> The usecase would be something like supporting incremental rendering of 
> attachments, even when the attachment is sent as a single websocket 
> message.
> 
> However I think it's a bit early to start talking about this feature for 
> websockets. The websocket API doesn't even have support for progress 
> events for individual messages. And even the basic API is still far from 
> widely deployed in browsers.
> 
> It's also less important since you can always support the use case by 
> chunking up the attachment into several websocket messages, and 
> reassemble them manually in the client. This is more work, but should 
> work.

Indeed. I've no current intention of addressing this in WebSockets.

-- 
Ian Hickson               U+1047E                )\._.,--....,'``.    fL
http://ln.hixie.ch/       U+263A                /,   _.. \   _\  ;`._ ,.
Things that are impossible just take longer.   `._.-(,_..'--(,_..'`-.;.'
Received on Thursday, 18 August 2011 22:34:01 GMT

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