Logout user via Keycloak REST API doesn't work

Question

I have issue while calling Keycloak\'s logout endpoint from an (mobile) application.

This scenario is supported as stated in its documentation:

Answer 1

Works with Keycloak 6.0.

Just for clarity: we do expire refreshToken, but accessToken IS STILL VALID while "Access Token Lifespan" time. Next time user tries to renew access token passing refresh token, Keycloak returns 400 Bad request, what should be catch and send as 401 Unauthorised response.

public void logout(String refreshToken) {
    try {
        MultiValueMap requestParams = new LinkedMultiValueMap<>();
        requestParams.add("client_id", "my-client-id");
        requestParams.add("client_secret", "my-client-id-secret");
        requestParams.add("refresh_token", refreshToken);

        logoutUserSession(requestParams);

    } catch (Exception e) {
        log.info(e.getMessage(), e);
        throw e;
    }
}

private void logoutUserSession(MultiValueMap requestParams) {
    HttpHeaders headers = new HttpHeaders();
    headers.setContentType(MediaType.APPLICATION_FORM_URLENCODED);

    HttpEntity> request = new HttpEntity<>(requestParams, headers);

    String url = "/auth/realms/my-realm/protocol/openid-connect/logout";

    restTemplate.postForEntity(url, request, Object.class);
    // got response 204, no content
}