Anyone know what triggers "ap_get_brigade failed during prefetch"? Is this a case of the client closing a connection?
I found a very similar post about this issue to this list from 2012, but no response:
As you can see from that post the logs are sparse:
Is the "referer" really the Referer not the request URI?
What also struck me as interesting with that 2012 post is that we have had some reports of uploads timing out with IE9 as well.