Constant http::header::AGE

pub const AGE: HeaderName = HeaderName{inner: Repr::Standard(StandardHeader::Age),}

Indicates the time in seconds the object has been in a proxy cache.

The 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.