13.4. Expressly Uncacheable Content and Hit Metering
Similar to the problems of caching cookied content is the situation in which the Web site explicitly prohibits caching some content. We refer to such content as expressly uncacheable content. Often the only reason content providers disallow caching is to get accurate usage statistics for their content. However, disallowing content caching for this purpose is a huge overkill on the part of Web site developers.
13.4.1. Cache-Friendly Approaches to Hit Metering
A special hit-metering protocol [Mogul and Leach 1997] has been designed to allow accurate usage tracking without completely defeating content caching. While the hit-metering protocol has not gained much acceptance in practice, there are ...
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