//      last modified: 105 days ago
    //             served:   5 days ago
    //   default lifetime: (105 - 5) / 10 = 10 days
    //            expires:  10 days from served date = 5 days from now
    server.enqueue(
      MockResponse.Builder()
        .addHeader("Last-Modified: " + formatDate(-105, TimeUnit.DAYS))
        .addHeader("Date: " + formatDate(-5, TimeUnit.DAYS))
        .body("A")
        .build(),