Age header contains the time in seconds the object has been in a proxy cache.
Age header is usually close to zero. If it is
Age: 0, it was probably just fetched from the origin server; otherwise It is usually calculated as a difference between the proxy's current date and the
Date general header included in the HTTP response.
A non-negative integer, representing time in seconds the object has been in a proxy cache.
|RFC 7234, section 5.1: Age||Hypertext Transfer Protocol (HTTP/1.1): Caching|
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