final Date tenSecondsAgo = new Date(now.getTime() - 10 * 1000L);
impl = createCachingExecChain(mockBackend, new BasicHttpCache(), CacheConfig.DEFAULT);
final HttpRequestWrapper req1 = HttpRequestWrapper.wrap(new HttpGet(
"http://foo.example.com/"));
req1.addHeader("If-None-Match", "\"etag\"");
final HttpResponse resp1 = new BasicHttpResponse(HttpVersion.HTTP_1_1,
HttpStatus.SC_NOT_MODIFIED, "Not modified");
resp1.setHeader("Content-Length", "128");
resp1.setHeader("ETag", "\"etag\"");