For ticket #24 HTTP redirect is used to log out of each SP. In the case tne endpoint doesn't support redirect the IdP can act as its own agent and POST a logout.
This issue ticket was originally removed from the tracker as it clashed with the pull request. See upstream ticket for migration details.
Metadata Update from @t0xic0der: - Issue close_status updated to: Fixed - Issue status updated to: Closed (was: Open)