I am currently developing an ASP.NET application that utilizes forms authentication with a timeout interval of five minutes. Within my application, there is a button that triggers an AJAX call to a function located on the service specified in my .svc file. I am wondering how I can determine, using client-side JavaScript, when the application has timed out. Alternatively, is it possible to detect this within the global.asax file, possibly utilizing the application_beginrequest event?
When discussing the session timeout, it is important to note that the IHttpSessionState.IsNewSession property should be true when this event occurs.
On the other hand, if you are talking about the authentication timeout, you will need to verify the expiration of the AuthenticationTicket.
Why not consider a different approach? Implement a client script that first checks for authentication expiration by sending a request to a special page or handler that returns a JSON structure indicating the current user's authentication status. Once you confirm that the user is still active, proceed with your main ajax action. This extra step may add another request, but it helps in keeping the timeout logic separate from the main ajax logic. You can even utilize it to display a warning message like "Your session will expire in x minutes."
To learn more about setting this up, visit this question and refer to my detailed answer. Remember, if you want to avoid extending the sliding expiration, make sure to configure the expiration page or handler as a separate virtual directory with forms authentication set to slidingExpiration=false.
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