7.1. Do Proxy Caches Deserve a Hearing?
Given large local caches in Web browsers, we can assume that most repeated accesses to the same page from the same user will be satisfied from the browser cache and thus be filtered from the requests seen by the proxy. This by itself does not imply that the utility of proxies diminishes with the rapid growth of local storage on browser machines. Consider the time diagram in Figure 7.1, which shows two streams of requests generated by two users. The name of the objects requested are marked on the time axes as X1, X2, and so on. Since neither user ever revisits any object in their individual request stream, both will have a zero hit rate at their browser caches, regardless of the cache size. However, if both ...
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