NEW 10904
Synchronous XMLHttpRequest not sent if made from an unload handler 
https://bugs.webkit.org/show_bug.cgi?id=10904
Summary Synchronous XMLHttpRequest not sent if made from an unload handler
Alexey Proskuryakov
Reported 2006-09-17 13:04:46 PDT
With bug 10852 fixed, making such a request no longer causes a crash, but the request needs to be actually sent - this is needed e.g. for usage statistics or for cleaning up server-side sessions. NB: looks like closing a window and navigating to a new URL are handled differently in this respect.
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Alexey Proskuryakov
Comment 1 2006-09-19 05:41:41 PDT
See also: http://www.w3.org/2006/webapi/track/actions/137
Darin Fisher (:fishd, Google)
Comment 2 2009-04-26 07:12:29 PDT
I don't think there are any promises that an asynchronous XHR is sent from unload. Browsers allow the web page to create such a request, but they make no guarantee about delivery. The requests spawned from unload are usually just aborted immediately afterwards. I believe web developers expect to have to do a _synchronous_ XHR if they want to make a network request from unload.
Alexey Proskuryakov
Comment 3 2009-09-18 12:43:47 PDT
<rdar://problem/5428049>
Alexey Proskuryakov
Comment 4 2010-06-14 10:30:02 PDT
FWIW, we track async version of this as bug 26817.
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