assertEquals("application/json;charset=UTF-8", mockResponse.getContentType());
        assertEquals("60", mockResponse.getHeaderValue("Retry-After"));
        assertTrue(mockResponse.getWriterOutput().contains("\"status\":9"));
        assertTrue(mockResponse.getWriterOutput().contains("\"retry_after\":60"));
    }

    @Test
    public void test_doFilter_apiAtThreshold() throws IOException, ServletException {
        setConfig(100, 80);