.code(HttpURLConnection.HTTP_NOT_MODIFIED)
        .build(),
    )
    server.enqueue(
      MockResponse.Builder()
        .body("B")
        .build(),
    )

    // A cache miss writes the cache.
    val t0 = System.currentTimeMillis()
    val response1 = get(server.url("/a"))
    assertThat(response1.body.string()).isEqualTo("A")
    assertThat(response1.header("Allow")).isNull()