@Test
public void testRevalidate() throws Exception {
IHttpRequestHandler reqHdl = new IHttpRequestHandler() {
public void onRequest(IHttpExchange exchange) throws IOException, BadMessageException {
HttpResponse resp = new HttpResponse(200, "text/plain", "test");
resp.setHeader("Cache-Control", "public, max-age=1000, must-revalidate");
exchange.send(resp);