The caching directives are specified in a comma-separated list. These directives typically override the default caching algorithms. The Cache-Control header allows a client or server to transmit a variety of directives in either requests or responses. We use the Cache-Control header for this purpose. The basic cache mechanisms in HTTP/1.1 are implicit directives to caches where server-specifies expiration times and validators. The goal of caching in HTTP/1.1 is to eliminate the need to send requests in many cases, and to eliminate the need to send full responses in many other cases. The HTTP/1.1 protocol includes a number of elements intended to make caching work.
HTTP is typically used for distributed information systems, where performance can be improved by the use of response caches.
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