Thread.sleep(10) // Make sure the timestamps are unique.
    val cacheHit =
      executeSynchronously(
        "/",
        "Accept-Language",
        "en-US",
        "Accept-Charset",
        "UTF-8",
      )

    // Check the merged response. The request is the application's original request.
    cacheHit.assertCode(200)
      .assertBody("A")

        .addHeader("Accept-Language", "en-US")
        .build()
    val response1 = client.newCall(request1).execute()
    assertThat(response1.body.string()).isEqualTo("A")
    val request2 =
      Request.Builder()
        .url(url)
        .addHeader("Accept-Language", "fr-CA, fr-FR")
        .addHeader("Accept-Language", "en-US")
        .build()