sink.close()
    assertThat<ByteString>(future1.get())
      .isEqualTo("abcdefghijklmnopqrst".encodeUtf8())
    assertThat<ByteString>(future2.get())
      .isEqualTo("abcdefghijklmnopqrst".encodeUtf8())
    assertThat(relay.isClosed).isTrue()
    assertFile(Relay.PREFIX_CLEAN, 20L, metadata.size, "abcdefghijklmnopqrst", metadata)
  }

    val response =
      MockResponse(
        body = "ABCDEFGHIJKLMNOPQR",
      )
    server.enqueue(response)
    server.enqueue(response)
    server.enqueue(response)
    assertContent("ABCDEFGHIJKLMNOPQR", getResponse(newRequest("/foo")))
    assertThat(server.takeRequest().sequenceNumber).isEqualTo(0)
    assertContent("ABCDEFGHIJKLMNOPQR", getResponse(newRequest("/bar?baz=quux")))