Spring Boot Single Sign On with KeyCloak...How to log out?

import org.springframework.http.ResponseEntity;
import org.springframework.security.core.Authentication;
import org.springframework.security.oauth2.core.oidc.user.OidcUser;
import org.springframework.security.web.authentication.logout.LogoutHandler;
import org.springframework.stereotype.Component;
import org.springframework.web.client.RestTemplate;
import org.springframework.web.util.UriComponentsBuilder;

import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import lombok.extern.slf4j.Slf4j;

@Slf4j
@Component
public class KeycloakLogoutHandler implements LogoutHandler {

    private final RestTemplate restTemplate = new RestTemplate();

    @Override
    public void logout(HttpServletRequest request, HttpServletResponse response, Authentication authentication) {
        OidcUser user = (OidcUser) authentication.getPrincipal();
        String endSessionEndpoint = user.getIssuer() + "/protocol/openid-connect/logout";
        UriComponentsBuilder builder = UriComponentsBuilder
            .fromUriString(endSessionEndpoint)
            .queryParam("id_token_hint", user.getIdToken().getTokenValue());

        ResponseEntity<String> logoutResponse = restTemplate.getForEntity(builder.toUriString(), String.class);
        if (!logoutResponse.getStatusCode().is2xxSuccessful()) {
            log.error("Unable to logout user");
        }
    }
}