Semantic Transparency

A cache behaves in a "semantically transparent" manner, with respect to a particular response, when its use affects neither the requesting client nor the origin server, except to improve performance. When a cache is semantically transparent, the client receives exactly the same response (except for hop-by-hop headers) that it would have received had its request been handled directly by the origin server.   附：这个词条的翻译很狗血，网上很多HTTP协议的中文版，可以去参观一下，基本就是机器翻译出来的... 为什么这么明显的问题，没有人指出来？害人不浅。