.addHeader("Cache-Control: max-age=60")
        .body("a")
        .build(),
    )
    val url = server.url("/a")
    assertThat(get(url).body.string()).isEqualTo("a")

    // Remove it with iteration.
    val i = cache.urls()
    assertThat(i.next()).isEqualTo(url.toString())
    i.remove()

    // Confirm that subsequent requests suffer a cache miss.
    server.enqueue(
      MockResponse.Builder()