RP-initiated logout URL at the issuer's frozen end_session route.
The id_token_hint is optional (RP-initiated logout §2): the issuer session
cookie can outlive the RP's local tokens (expired, or a widget-only
connection), and logout must still end it. client_id is always sent, so the
issuer can validate post_logout_redirect_uri without the hint.
RP-initiated logout URL at the issuer's frozen end_session route.
The id_token_hint is optional (RP-initiated logout §2): the issuer session cookie can outlive the RP's local tokens (expired, or a widget-only connection), and logout must still end it. client_id is always sent, so the issuer can validate post_logout_redirect_uri without the hint.