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Most wide-area caching schemes are client initiated. Decisions on when and where to cache information are made without the benefit of the server's global knowledge of the situation. We believe that the server should play a role in making these caching decisions, and we propose geographical push-caching as a way of bringing the server back into the loop. The World Wide Web is an excellent example of a wide-area system that will benefit from geographical push-caching, and we present an architecture that allows a Web server to autonomously replicate HTML pages.
Gwertzman et al. (2002) studied this question.