Logout process on Shibboleth IdP v4.2.

[Rod Widdowson]

> I'd like to clarify which version is called the modern version of the IdP.

4.2.1: See  [1] 

> If it's in version 3.4., 

No: See [2]

"The Shibboleth IdP V3 software has reached its End of Life and is no longer supported. This documentation is available for
historical purposes only. See the IDP4 wiki space for current documentation on the supported version."

Rod

[1] https://shibboleth.atlassian.net/wiki/spaces/IDP4/pages/1265631499/ReleaseNotes
[2] https://shibboleth.atlassian.net/wiki/spaces/IDP30/overview