This mechanism is server-to-server, making it more reliable than front-channel methods that depend on the user's browser. The IdP will directly notify each RP (Relying Party aka Service Provider) that a user's session has ended by sending a signed logout_token. The RP must validate this token and terminate the corresponding local session.
Key Benefits:
Higher reliability and security: Server-to-server logout does not rely on the user’s browser, reducing failures caused by network issues, blocked scripts, or closed sessions.
Consistent session termination: Signed
logout_tokennotifications ensure each RP can securely validate and promptly terminate the correct local user session.