): Http2Connection {
    peer.setClient(client)
    peer.sendFrame().settings(settings!!)
    peer.acceptFrame() // ACK
    peer.play()
    return connect(peer)
  }

  /** Builds a new connection to `peer` with settings acked.  */
  private fun connect(
    peer: MockHttp2Peer,
    pushObserver: PushObserver = IGNORE,