fresh?

# File actionpack/lib/action_dispatch/http/cache.rb, line 38
        def fresh?(response)
          last_modified = if_modified_since
          etag          = if_none_match

          return false unless last_modified || etag

          success = true
          success &&= not_modified?(response.last_modified) if last_modified
          success &&= etag_matches?(response.etag) if etag
          success
        end