DWR

DWR 2.0.2, setActiveReverseAjax(true) is breaking in IE7.

IE is saying "The data necessary to complete this operation is not yet available", in
dwr.engine._checkCometPoll (@ var text = req.responseText;)

Possible underlying cause is batch.map.partialResponse getting set to true for IE with rpcType=XHR. This is due to the following bug:

engine.js, branch_2_0, line 423 in dwr.engine._poll:

else if (navigator.userAgent.indexOf("Safari/")) {
  batch.rpcType = dwr.engine.XMLHttpRequest;
  batch.map.partialResponse = dwr.engine._partialResponseYes;
}

indexOf check returns -1 for UA string not containing "Safari/", so the condition evaluates true for all non-Safari browsers, MSIE included.

Looks like this was introduced in 1.95.2.9 -- the explicit check for MSIE was commented out disabling htmlfile), so the logic now falls through to the Safari case.