Caching - Age:

Caching - Age:

• HTTP/1.1 introduces Age: header, to allow conservative age of document computation
• the Age: value is the sum of the time that the response has been resident in each of the caches along the path from the origin server, plus the amount of time it has been in transit along network paths.
• Enables reliable cache expiration
• See section 13.2.3

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