responseBody.close()
    assertEquals(if (connectionType == H2) 1 else 0, client.connectionPool.connectionCount())
  }

  @ParameterizedTest
  @ArgumentsSource(CancelModelParamProvider::class)
  fun cancelAndFollowup(mode: Pair<CancelMode, ConnectionType>) {
    setUp(mode)
    val responseBodySize = 8 * 1024 * 1024 // 8 MiB.
    server.enqueue(
      MockResponse
        .Builder()
        .body(
          Buffer()