[webkit-dev] XHR responseArrayBuffer attribute

[James Robinson]

On Mon, Sep 27, 2010 at 6:37 PM, Maciej Stachowiak <mjs at apple.com> wrote:

>
> On Sep 27, 2010, at 3:19 PM, Michael Nordman wrote:
>
> Webkit's XHR currently does not keep two copies of the data that I can see.
> I think we should avoid that.
>
>
> We could keep the raw data around, which hopefully is directly usable as an
> ArrayBuffer backing store, and only translate it to text format when/if the
> client requests responseText.
>
>
It would be unfortunate to have to keep the raw data around after the page
access .responseText, given that the overwhelming majority of pages will
touch .responseText and nothing else.  I found when improving the V8 XHR
implementation that the memory footprint of .responseText being held off of
the XHR object itself was often significant so I would be very reluctant to
grow it by an addition 50-100% (depending on encoding) in the common case.

- James
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