> So I think we should keep the SAML logout request "as is" (custom code in the 
> core). I consider the SAML logout request more as a logout request in XML 
> format than a real implementation of the SAML protocol.

+1

> So I implement a custom front-channel SLO. Each CAS service can be configured 
> with a logout url, which will be called from a hidden image in the CAS logout 
> page.

I believe this implementation is fairly common; perhaps some slight
variances. We did this ourselves for many years, and it was successful
in general, but the hassle was keeping up with service registration
for _every_ service that used CAS. We were serious then, and remain
so, that every service be capable of participating in single sign out.
I am personally quite happy to leverage wildcards to let everyone in
with a limited set of attribute release, then have a handful of
special cases.

Here's another solution I sketched out a while back but never pushed;
now seems like a good time to share:

https://wiki.jasig.org/display/CAS/Proposal%3A+Front-Channel+Single+Sign-Out

M

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