Caching Characteristics of Internet and Intranet Web Proxy Traces

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.