Also, if you use the same navigation images throughout your site, they'll be served from the browser cache almost instantaneously. Proxy Caches Web proxy caches work on the same principle, but a much larger scale. Because proxy caches usually have a large number of users behind them, they are very good at reducing latency and traffic. That's because popular objects are requested only once, and served to a large number of clients. Most proxy caches are deployed by large companies or ISPs that want to reduce the amount of Internet bandwidth that they use.
Proxy caches are a type of shared cache .
Web caching is one of the most misunderstood technologies on the Internet. Webmasters in particular fear losing control of their site, because a cache can 'hide' their users from them, making it difficult to see who's using the site. Unfortunately for them, even if no Web caches were used, there are too many variables on the Internet to assure that they'll be able to get an accurate picture of how users see their site. If this is a big concern for you, this document will teach you how to get the statistics you need without making your site cache-unfriendly. Another concern is that caches can serve content that is out of date, or stale .