if (response.getHttpStatus().orElse(200) == 404) {
                logger.debug("Not found: {}", targetUrl);
                saveError(messages -> messages.addErrorsNotFoundOnFileSystem(GLOBAL, targetUrl));
                return redirect(ErrorAction.class);
            }
            return response;
        } catch (final Exception e) {
            logger.warn("Failed to load: {}", doc, e);

    }

    public void test_addErrorsNotFoundOnFileSystem() {
        String property = "testProperty";
        String arg0 = "file.txt";
        FessMessages result = messages.addErrorsNotFoundOnFileSystem(property, arg0);
        assertNotNull(result);
        assertSame(messages, result);
        assertTrue(messages.hasMessageOf(property));
    }

    public void test_addErrorsCouldNotOpenOnSystem() {