return new AuthorizationCodeRequestUrl(getOicAuthServerUrl(), getOicClientId())//
                .setScopes(Arrays.asList(getOicScope()))//
                .setResponseTypes(Arrays.asList("code"))//
                .setRedirectUri(getOicRedirectUrl())//
                .setState(state)//
                .build();
    }

    protected byte[] decodeBase64(String base64String) {
        if (base64String == null) {