Adding a return URL during logout with CAS

CAS (Central Authentication Service) is a single-sign-on service (say that several times quickly) and through accessing a CAS /logout URL, as an application, you’re able to log the given user out.  What wasn’t clear (by Googling) was whether there’s a possibility to redirect the user back to the original application (or a given URL).  I now know, thanks to the CAS Protocol Documentation (section 2.3), that any posts that mention adding ?service=http://my.url/ to the /logout URL are incorrect, as this isn’t a valid parameter (at least not at time of writing).

However, you can add a ?url=http://my.url/ to the logout URL and get this (likely, depends on your CAS settings) displayed as a link on the logout page. So, a full URL like this is good to go:

https://cas.foo.edu/cas/logout?url=http://davidjb.com/

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