private static Map getApprovalModel(final String errorCode) {
        val map = new LinkedHashMap<String, Object>();
        map.put("prefix", OAuth20DeviceUserCode.PREFIX);
        if (StringUtils.isNotBlank(errorCode)) {
            map.put("error", errorCode);
        }
        return map;
    }
Handle request internal model and view.

@param request  the request
@param response the response
@return the model and view
support/cas-server-support-oauth-core-api/src/main/java/org/apereo/cas/support/oauth/web/endpoints/OAuth20DeviceUserCodeApprovalEndpointController.java