其它的方法对中介更有价值，因为它们说明了失效如何被自动处理以及中间缓存如何去优化它们的行为。
The other methods are more valuable to intermediaries because they say something about how failures can be automatically handled and how intermediate caches can optimize their behavior.
第一节中介绍的技术只适用于生成最终结果的所有信息都可保存为中间结果的情况。
The technique presented in the first section only works if all the information necessary to derive the final result can be stored in the intermediate result.
与服务器端或客户端的缓存不同，中介缓存驻留在中间的通信通道中。
Unlike the cache on the server side or client side, the mediation cache resides in the communication channel in the middle.
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