原文http://www.squid-cache.org/Intro/why.html
The developers of the HTTP protocol identified early on that there was going to be exponential growth in content and, concerned with distribution mechanisms, added powerful caching primitives.
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http协议的开发者很早就发现了http的内容是以指数形式增长的，他们专注于分发协议，添加了强大的缓存原语
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http协议的开发者们很早就确定与分布式机制及原生的缓存相关的内容将以指数形式增长。