A request or a response can have additional pieces of medi data set along with the requeste response. Cash control headers tell either the browser or the server how er, specifically, how s or stale the content is and if it should fetch new content before it goes ahead. Cashing means that you are saving the result that of something that has been generated - an image, some h tmel whether it is a list of dogs,. All o those things take work. And that's what cashing is, is that we will put it in a bag somewhere so that we can retrieve it from that bag in the future if it is still fresh.

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