![]() When a cache miss occurs, the data must be fetched from the source - or from another level of cache, if the system has more than one level. When the data is not found, it's called a cache miss. When the CPU requests data in the cache and that data is found, it's called a cache hit. This faster, more expensive memory is often called the cache, a term derived from the older meaning: a place where weapons or other items are hidden. The first use of this concept was to keep the data that a central processing unit (CPU) is most likely to use in the near term in faster memory. What is caching?Ĭaching is as old as computing. ![]() But the proxy isn't entirely invisible its Internet Protocol address must be specified as a configuration option to the browser or other protocol program. To the user, web proxy caching is invisible - all internet requests and the responses appear to be coming from the addressed place on the internet. The dual function it performs is sometimes referred to as web proxy caching. A proxy server that's also a cache server is often called a caching proxy. ![]() That server enables outgoing requests to go out, but screens all incoming traffic.īecause a proxy server helps match incoming messages with outgoing requests, it's perfectly placed to also cache the files that are received for later recall by any user. Typically, these enterprise resources are being protected by a firewall server. A cache server is sometimes called a cache engine.Ī proxy server is often also a cache server, as it represents users by intercepting their internet requests and managing them. Cache servers also enable users to access content offline, including rich media files or other documents. By placing previously requested information in temporary storage - or cache - a cache server both speeds up access to data and reduces demand on an enterprise's bandwidth.
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