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IE11 - XMLHttpRequest level 2 onprogress event does not fire if chunk data is greater than 4kiB

I am using XMLHTTPRequest level 2 to keep a sticky connection to the server.

In IE10, Chrome, and Firefox, each data packet received fires an onprogress event as expected. However, in IE11, if a chunk has more than 4kiB, the event is not fired for that chunk. It will only fire after I receive something else.

I have applied a workaround that sends dummy data after 0.5 seconds if the previous chunk was greater than 4k, so onprogress is fired on dummy data and I can get the data I want.

I would like to know: the actual behavior of IE11 with respect to onprogress, to see if there is a better fix for this problem or if the workaround is actually the correct fix.

Any help?

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Have you tested some other events like "readystatechange", "load" or "loadend"? If so, I think there is not much to do with IE only handling strange events. Depending on the code running on the server, this can cause some side effects on the server side.



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