medium10 pts · first answer countsnetworkinghttp

Revalidating a cached file with an ETag

A browser holds a cached app.js with ETag "v42", and its max-age has expired. It sends If-None-Match: "v42", and the file has not changed. What should the server reply?

A.200 OK with the full file sent againB.302 Found redirecting to the cached copyC.412 Precondition Failed, empty bodyD.304 Not Modified with an empty body

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Revalidating a cached file with an ETag

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