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Re: Lazy Blob

From: Boris Zbarsky <bzbarsky@MIT.EDU>
Date: Wed, 01 Aug 2012 21:16:22 -0400
Message-ID: <5019D4E6.3040301@mit.edu>
To: public-webapps@w3.org
On 8/1/12 11:44 AM, Glenn Maynard wrote:
> Ideally, a new responseType could be added to XHR which operates like
> "blob", except instead of reading the whole resource, it just performs a
> HEAD to retrieve the response length and immediately returns the Blob,
> which can be read to perform further Content-Range reads.

Unless the server is one of the common ones with broken HEAD handling. 
Or unless the resource is served with Content-Encoding:gzip, in which 
case your Content-Range is all sorta broken.  :(

> The trouble is chunked responses, where the length of the resource isn't
> known in advance, since Blobs have a static length and aren't designed
> for streaming.

That's another trouble, yes.

-Boris
Received on Thursday, 2 August 2012 01:16:52 GMT

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