Subject: [httpwg/http-extensions] Lifetime of Key headers (#187)

From: HTTP issue updates <[email-masked]>
Date: Tue, 31 May 2016 12:20:06 -0700

It could be better for some implementers if the lifetime of the Key headers is the same as the Cache-Control: from the response wherein the Key header was seen. The spec today says that the Key header used should be the last one seen, but this can cause some complex, and/or performance expensive issues for certain cache implementations.

Unless the intent here is that I can purge old variants from the cache, that are still fresh, by changing the Key header for subsequent variants?

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