ajax - ie save onunload bug

Question

I have a dynamic ajaxy app, and I save the state when the user closes the explorer window. It works ok in all browsers but in IE there is problem. After I close twice the application tab, i can't connect anymore to the server.

My theory is that the connection to the server fail to complete while the tab is being closed and somehow ie7 thinks that it has 2 outstanding connections to the server and therefore queues new connections indefinitely.

Any one has experienced this, any workaround or solution?

Answer 1

In IE if you use long-polling AJAX request, you have to close down the XHR connection on 'unload'. Otherwise it will be kept alive by browser, even if you navigate away from your site. These kept alive connections will then cause the hang, because your browser will hit the maximum open connection limit.

This problem does not happen in other browsers.