Browser Timeouts

It’s browser dependent.
“By default, Internet Explorer has a KeepAliveTimeout value of one minute and an additional limiting factor (ServerInfoTimeout) of two minutes. Either setting can cause Internet Explorer to reset the socket.” – from IE support http://support.microsoft.com/kb/813827

Firefox is around the same value I think as well.

Usually though server timeout are set lower than browser timeouts, but at least you can control that and set it higher.

You’d rather handle the timeout though, so that way you can act upon such an event.
See this thread: How to detect timeout on an AJAX (XmlHttpRequest) call in the browser?

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