| Subject: | Logout behaviour change in CAS 3 |
It seems there's a behaviour change in version 3 that needs to be handled on the library.
The url parameter defined in the former CAS 2.0 specification is not a valid parameter in CAS 3.0 anymore. CAS Servers MUST ignore given url parameters. A CAS client MAY provide the service parameter as described above, as this ensures the parameter is validated against the registered service URLs when operating in non-open mode. See 2.3.2 for details:
https://github.com/apereo/cas/blob/master/docs/cas-server-documentation/protocol/CAS-Protocol-Specification.md#23-logout