On Sat, 21 May 2011 09:36:51 +0200, Jonas Sicking <[email protected]> wrote:
First, should it return a new ArrayBuffer every time the property is accessed (This is how the mozResponseArrayBuffer property in FF4 behaves), or should it return the same buffer every time? Since arraybuffers are mutable, there's a risk that one consumer will modify the response such that all other consumers see a modified result. On the other hand creating a new buffer every time can be quite expensive (at least without complex/slow copy-on-write implementations). It also would result in the surprising property that xhr.response != xhr.response.
Per the specification you always get the same ArrayBuffer/Blob/Document.
Second, what should .response return before the download finishes? It would be nice if you could access partial results. However ArrayBuffers are fixed size and we won't know the total size until the whole download is finished. We could return a copy on each access, but again that would be somewhat expensive. For now we're going to return null during loading in FF6 when .responseType is set to "arraybuffer".
That is what the specification requires... -- Anne van Kesteren http://annevankesteren.nl/
