Detect session timeout with on AJAX request with javascript

Hi there.

I've been looking for a way to detect on the client side that the ajax
request he performed was not successful because the user session has
expired.
My problem is not related with security level (seen too many people
with this one..).

I've red this blog post:
- http://deadlytechnology.com/php/ajax-session-expire-bug/
that explains that this was a bug, and also the supposed correction:
-
http://cakephp.lighthouseapp.com/projects/42648/tickets/658-session-timeout-auth-component-403-status-code-being-dropped-when-request-via-ajax

I've also looked into the code, and it seems that if the user performs
an ajax request without a valid session, all i can get is a 403 server
error on the client side.

Is this actually the only way to check if i should redirect the user
to the login page?

I know i can also override the redirect method to handle this better,
but i think that it makes sense that the framework can handle this.

Thanks is advance for any response

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