response1.close()
    val call2 = client.newCall(Request(server.url("/")))
    val response2 = call2.execute()
    assertThat(response2.body.string()).isEqualTo("abc")
  }

  @Test
  fun concurrentRequestWithEmptyFlowControlWindow() {
    server.enqueue(
      MockResponse
        .Builder()
        .body(Buffer().write(ByteArray(Http2Connection.OKHTTP_CLIENT_WINDOW_SIZE)))
        .build(),
    )
    server.enqueue(