Importance

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Abstract

A document may be received over a network that contains a link to a resource. Various contexts, including Internet browsers, can operate more effectively, and make better use of available bandwidth, by caching network resources so that repeated requests for cached resources can be satisfied from a local cache and avoid a duplicative transfer from a server. Instead of utilizing typical cache operations, such as taught in Request For Comments (RFC) 2616, where the server hosting the resource is queried to resolve cache correctness, instead a link to a resource is constructed so that it contains all information necessary to make a cache correctness decision without having to query the server hosting the linked resource. In addition, the link may be constructed so that the cache determination is made with respect to the contents of the linked resource, rather than with respect to metadata about the resource, e.g., name, creation date, location, etc.

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First Claim