Request.Builder()
        .url(url)
        .header("Accept-Language", "fr-CA")
        .build()
    val response1 = client.newCall(request).execute()
    assertThat(response1.body.string()).isEqualTo("A")
    val request1 =
      Request.Builder()
        .url(url)
        .header("Accept-Language", "fr-CA")
        .build()
    val response2 = client.newCall(request1).execute()

        .cache(cache)
        .build()

    // Store a response in the cache.
    val url = server.url("/")
    val request1SentAt = System.currentTimeMillis()
    executeSynchronously("/", "Accept-Language", "fr-CA", "Accept-Charset", "UTF-8")
      .assertCode(200)
      .assertBody("A")
    val request1ReceivedAt = System.currentTimeMillis()
    assertThat(server.takeRequest().headers["If-None-Match"]).isNull()