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This paper studies the caching characteristics of HTTP requests and responses that pass through production Web proxies. This paper evaluates caching opportunities and problems. Traces with 5.9 million entries from a large Internet Service Provider (ISP) and 2.0 million entries from an Intranet firewall are studied. The authors find maximum cache hit rate opportunities of about 40% for an ISP and 70% for an Intranet. Cache size needs and document residence times are also examined.
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