Posted by Derek Fountain on 01/01/08 11:05

I've got a function that builds a webpage containing a flash animation.
As the page goes to the browser, the browser sees the link to the
embedded FLV file and opens a new connection to retrieve it. A moment
later the page download is completed, and a few seconds after that,
depending on the user's connection speed, the FLV download completes and
the use has the content. All fine.

The issue comes if the user receives the page, but then hits the
'logout' link on it before the FLV has completely downloaded. The
browser goes to fetch the logout page (which deletes the session, etc.)
but it seems that since there's still a connection open for the FLV
stream something odd happens. It appears the session doesn't get
deleted. If, having received the logout page, the user hits their back
button, they go back to the previous page and it all still works - they
haven't been logged out.

This doesn't happen every time, so I'm guessing it's a race condition.
Can anyone explain what's happening and what I can do about it?

--
Derek Fountain on the web at http://www.derekfountain.org/

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