[BOOK|EPUB] Cache

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Protocol features that allow an origin server or user agent to explicitly request and control non-transparent operation. Invalidation After Updates or Deletions The effect of certain methods performed on a resource at the origin server might cause one or more existing cache entries to become non- transparently invalid. As a general rule, if there is any apparent conflict between header values, the most restrictive interpretation is applied that is, the one that is most likely to preserve semantic transparency.

Each entry has associated data, which is a copy of the same data in some backing store. In the discussion below, the values can be represented in any form appropriate for arithmetic operations. A client can usually detect that such a response was taken from a cache by comparing the Date header to the current time. In this approach, data is loaded into the cache on read misses only.

View web pages cached in Google Search Results - Large responses require many roundtrips between the client and server, which delays when they are available and when the browser can process them, and also incurs data costs for the visitor.