inFinished: Boolean,
  ) {
    lock.assertNotHeld()

    val open: Boolean
    this.withLock {
      if (!hasResponseHeaders ||
        headers[Header.RESPONSE_STATUS_UTF8] != null ||
        headers[Header.TARGET_METHOD_UTF8] != null
      ) {
        hasResponseHeaders = true
        headersQueue += headers
      } else {
        this.source.trailers = headers
      }
      if (inFinished) {

    peer.acceptFrame() // SYN_STREAM
    peer.acceptFrame() // PING
    peer.sendFrame()
      .headers(false, 3, headerEntries(Header.RESPONSE_STATUS_UTF8, "HTTP/1.1 100"))
    peer.sendFrame()
      .headers(false, 3, headerEntries(Header.RESPONSE_STATUS_UTF8, "HTTP/1.1 200"))
    peer.sendFrame().ping(true, Http2Connection.AWAIT_PING, 0)
    peer.play()

    // Play it back.
    val connection = connect(peer)