设置了http缓存表题头之后，可以在这些网络资源上对文档进行缓存，客户端请求也可在不必返回原始服务器的情况下得以满足。

When HTTP cache headers are set, the documents can be cached on these network resources, and client requests can be satisfied without having to go back to the origin server.

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第一，缓存帮助减少服务器上的资源开销。

One, it helps reduce resource consumption on your server.

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图4显示了Feed生成器、资源集合和潜在Web服务器或代理缓存间的关系。

Figure 4 illustrates the relationship between the feed producer, the resource collection, and a potential web server or proxy cache.

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