Single sign-out: how to specify callback URL

[vemv]

With single sign-out turned on, when I log out via the CAS server (as opposed to one of the consumer applications), the server tries notifying the consumers, using the "service" urls.

These service urls seem to have a fixed value: that that the Rails consumer app had when the before_filter caused a redirection for logging in.

Example:

• User logged out, has no ticket
• Tries going to my.app.com/foo
• Gets redirected to cas.server.com, and the ticket's service value gets bound to my.app.com/foo
• Uses the app for a while
• Goes to cas.server.com/logout, logs out
• Server notifies app, but sends a request to /foo (some arbitrary domain-specific functionality) rather than /logout (which would delete the app's login cookie).

How to supply a custom callback logout URL?

[vemv]

Thought I found a solution but I didn't, sorry for the noise.