[keycloak-user] keycloak saml logout

hi all! i try use Keycloak as IDP for gitlab via SAML protocol. autentification is work well. but i can't configure integration with logout service gillab can redirect user after logout to customizable url if it redirect to main SAML entry point ( root/realms/{realm}/protocol/saml/) i see error "invalid request" if i try type anybody to field "Logout Service POST Binding URL" and redirect to this url - i see error 404 or blank screen. In the documentation this service is practically not described. Is there a standard entry point for logout servise (like standart SSO point root/realms/{realm}/protocol/saml/clients/{url name}) ?