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13.2.2 Heuristic Expiration Connected: An Internet Encyclopedia
13.2.2 Heuristic Expiration

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13.2.2 Heuristic Expiration

13.2.2 Heuristic Expiration

Since origin servers do not always provide explicit expiration times, HTTP caches typically assign heuristic expiration times, employing algorithms that use other header values (such as the Last-Modified time) to estimate a plausible expiration time. The HTTP/1.1 specification does not provide specific algorithms, but does impose worst-case constraints on their results. Since heuristic expiration times may compromise semantic transparency, they should be used cautiously, and we encourage origin servers to provide explicit expiration times as much as possible.


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Connected: An Internet Encyclopedia
13.2.2 Heuristic Expiration

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