Question: HTTP supports cache coherence. The If-Modified-Since header is used to check if the resource has been changed, and thus if the cache page is still

HTTP supports cache coherence. The If-Modified-Since header is used to check if the resource has been changed, and thus if the cache page is still valid. Since client requests can be made for pages containing multimedia, such as images, video, sound, and so forth, in addition to HTML, describe the effectiveness of using the If- Modified-Since header for HTML versus JPEG images (i.e., which one performs better with this technique and why?)

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