dateFormat.timeZone = TimeZone.getTimeZone("America/New_York")
    val lastModifiedString = dateFormat.format(lastModifiedDate)
    val servedString = dateFormat.format(servedDate)

    // This response should be conditionally cached.
    server.enqueue(
      MockResponse
        .Builder()
        .addHeader("Last-Modified: $lastModifiedString")
        .addHeader("Expires: $servedString")
        .body("A")