}
  }

  @Test
  fun upgrade() {
    executeAndCheckUpgrade(upgradeRequest())
  }

  @Test
  fun upgradeWithEmptyRequestBody() {
    executeAndCheckUpgrade(upgradeRequest().newBuilder().post(RequestBody.EMPTY).build())
  }

  @Test
  fun upgradeWithNonEmptyRequestBody() {
    executeAndCheckUpgrade(
      upgradeRequest()
        .newBuilder()
        .post("Hello".toRequestBody())

    val message6 = message2 + message2
    client.send(message6)
    serverListener.assertTextMessage(message6)
    closeWebSockets(client, server)
    val upgradeRequest = webServer.takeRequest()
    assertThat(upgradeRequest.headers["Sec-WebSocket-Extensions"])
      .isEqualTo("permessage-deflate")
  }

  @Throws(Exception::class)
  private fun extensionNegotiationFailure(extensionsHeader: String) {