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[XHR2] Overriding the MIME type in XHR2 after the request has started

From: Henri Sivonen <hsivonen@iki.fi>
Date: Tue, 19 Apr 2011 12:18:39 +0300
To: public-webapps@w3.org
Message-ID: <1303204719.12278.27.camel@shuttle>
Adding [XHR2] to the subject to comply with the instructions. Sorry
about the noise.

On Tue, 2011-04-19 at 12:04 +0300, Henri Sivonen wrote:
> In reference to
> http://dev.w3.org/2006/webapi/XMLHttpRequest-2/#dom-xmlhttprequest-overridemimetype
> It seems to me that XHR2 allows overrideMimeType() to be called at any
> time so that it affects the calls to the responseXML getter the
> overrideMimeType() call. And the subsequent overrideMimeType() calls can
> make the responseXML getter return different things later.
> This is bad, because it requires synchronous parsing when the
> responseXML getter is called. OTOH, if overrideMimeType() calls were
> honored only before the send() method has been called, parsing to DOM
> could be implemented progressively (potentially off-the-main-thread) as
> the resource representation downloads and the responseXML getter could
> return this eagerly-parsed Document and always return the same document
> on subsequent calls.
> Are there compelling use cases for allowing overrideMimeType() after
> send() has been called? I assume that typically one would use
> overrideMimeType() when knowing ahead of time that the config of the
> server responding to XHR is bogus.

Henri Sivonen
Received on Tuesday, 19 April 2011 09:19:13 UTC

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