[Twisted-web] How can I direct a user to a "you are being logged off" page?

[Maarten ter Huurne]

On Monday 10 May 2010, markscottwright at gmail.com wrote:

> I'm using twisted web (not nevow) in an application right now. I'm
> handling expiration by having a LogonState Session variable, which has
> an is_logged_in member that defaults to False. All requests are checked
> for this and redirected to my logon page if is_logged_in is not true.
> 
> This is all working fine, but unfortunately, it means that timeouts are
> abrupt - you are just re-directed to a logon page with no warning the
> next time you try to access a resource after session timeout.
> 
> Session expiration callbacks don't seem that useful here. I'll be
> notified, but then the session is gone and I no longer have any way of
> knowing if the next request is from someone who once had a valid
> session, but no longer does.

Since the session is remembered by storing a session ID in a session cookie, 
maybe you could check for the presence of that cookie in the request? If it 
is present, you could add an argument like "reason=expired" to the login 
redirect.

Bye,
		Maarten