13.2. Modified Content and Stale Delivery Avoidance
When an object is updated on the origin server, its cached copies become obsolete and must be refetched to avoid stale delivery. Since caching is largely outside the control of content providers, there is an inherent tension between caching and providers' desire to ensure their content freshness. Some Web developers simply make their entire content uncacheable to guarantee freshness. However, this approach is grossly misguided. It reduces user-perceived performance of the perpetrating Web sites and overloads the Internet for everyone else.
13.2.1. Cache-Friendly Approaches to Stale Delivery Avoidance
We have discussed throughout the book a multitude of mechanisms available to the Web developer ...
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