is not evident; stop here - No Proxy Found If the page age is more than 30 seconds you may have picked up a fresher version of this page loaded into a proxy cache by someone else. It may be worth repeating the test to see if you get a more conclusive result. Background Discussion This test makes unique pages that behave as static pages. Caches operate on static pages because they can usually rely on them staying valid for a period of time. These pages set a last modified date of three days before they are generated. They also set an expiry time of three days days into the future. This should encourage most caches to serve future requests for this page from the cache unless explicitly bypassed with the browser refresh button. The tricky part of this test is to make sure that you are not just getting the page from the browser's local cache. Notice how each time you visit the cache-test (without hitting refresh or clearing the browser's cache) it gives you the same version which it is getting from the browser's cache. This test will only expose caching proxies. It will not expose proxies that have some other goal or those that are selective about which sites they cache. Selected Request Headers The following headers were among those received with the request that generated this page. These headers affect the behaviour of caches.