Question: The If-Modified-Since header can be used to check whether a cached page is still valid. Requests can be made for pages containing images, sound, video,

The If-Modified-Since header can be used to check whether a cached page is still valid. Requests can be made for pages containing images, sound, video, and so on, as well as HTML. Do you think the effectiveness of this technique is better or worse for JPEG images as compared to HTML? Think carefully about what ''effectiveness'' means and explain your answer.

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Most likely HTML pages change more often than JPEG files Lots of sites fiddle with their ... View full answer

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