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Detecting callback timeout

I have a ScriptControl which does a Callback to my page. Success and error responses from the server work fine and go to my client handler functions. However, if I stop the web server, then the request can't go through (should time out), but no client functions are ever called.

I'm defining my handler functions through Page.ClientScript.GetCallbackEventReference, but I don't see any overloads for timeout. How can I detect this condition?

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