private void verifyCacheHeadersAbsent(HttpResponse response) {
    assertNull("Cache-Control value should be null", response.headers().get(RestUtils.Headers.CACHE_CONTROL));
    assertFalse("Pragma value should not be present", response.headers().contains(RestUtils.Headers.PRAGMA));
    assertFalse("Expires value should not be present", response.headers().contains(RestUtils.Headers.EXPIRES));
  }
Verify tht cache headers are absent.
@param response {@link HttpResponse} object to get cache headers from.
ambry-frontend/src/integration-test/java/com/github/ambry/frontend/FrontendQuotaIntegrationTest.java