Can I cache this?

Usage

Constructor options

`storable()`

`satisfiesWithoutRevalidation(newRequest)`

`responseHeaders()`

`timeToLive()`

`toObject()`/`fromObject(json)`

Refreshing stale cache (revalidation)

`revalidationHeaders(newRequest)`

`revalidatedPolicy(revalidationRequest, revalidationResponse)`

Yo, FRESH

Used by

Implemented

Unimplemented

Trusting server `Date`