.build()
          }

          // This is not an upgrade response.
          else -> {
            if (isUpgradeRequest) {
              exchange.noRequestBody() // Failed upgrade request has no outbound data.
            }
            val responseBody = exchange.openResponseBody(response)
            response
              .newBuilder()
              .body(responseBody)
              .trailers(

  val sink: BufferedSink,
  val random: Random,
  private val perMessageDeflate: Boolean,
  private val noContextTakeover: Boolean,
  private val minimumDeflateSize: Long,
) : Closeable {
  /** This holds outbound data for compression and masking. */
  private val messageBuffer = Buffer()

  /** The [Buffer] of [sink]. Write to this and then flush/emit [sink]. */
  private val sinkBuffer: Buffer = sink.buffer

   * servers, it should be the agreed-upon extensions immediately.
   */
  private var extensions: WebSocketExtensions?,
  /** If compression is negotiated, outbound messages of this size and larger will be compressed. */
  private var minimumDeflateSize: Long,
  private val webSocketCloseTimeout: Long,
) : WebSocket,
  WebSocketReader.FrameCallback,
  Lockable {

    val ping = peer.takeFrame()
    assertThat(ping.type).isEqualTo(Http2.TYPE_PING)
  }

  @Test fun serverWritesTrailersWithData() {
    // We buffer some outbound data and headers and confirm that the END_STREAM flag comes with the
    // headers (and not with the data).

    // Write the mocking script. for the client
    peer.setClient(true)