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Obsolete since Gecko 22
This boolean indicates if the response is expected to be a stream of possibly multiple XML documents. If set to
true, the content type of the initial response must be
multipart/x-mixed-replace or an error will occur. All requests must be asynchronous.
This enables support for server push; for each XML document that's written to this request, a new XML DOM document is created and the
onload handler is called between documents.
Note: When this is set, the
onload handler and other event handlers are not reset after the first XMLdocument is loaded, and the
onload handler is called after each part of the response is received.