This page test exercises a bug found in Internet Explorer where if a POST request is sent at the same time the server closes the persistent connection, Internet Explorer sends a malformed request, and can end up locking up.
The test is done by examining the Keep-Alive header sent by the server, and sending a POST at the time we expect the connection to time out. The trickiness here is in calculating when to send the POST to exploit the bug. Otherwise, there is nothing unusual about the operation being performed.
The timer on the screen is a good indication of whether the browser is still responding. If the clock stops, all bets are off!
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