* @param out true to create an output stream that we can use to send data to the remote peer.
   *     Corresponds to `FLAG_FIN`.
   */
  @Throws(IOException::class)
  fun pushStream(
    associatedStreamId: Int,
    requestHeaders: List<Header>,
    out: Boolean,
  ): Http2Stream {
    check(!client) { "Client cannot push requests." }

            socket = socket,
          ),
        )
        val hasBody = pushPromise.response.body != null
        val pushedStream = stream.connection.pushStream(stream.id, pushedHeaders, hasBody)
        writeResponse(pushedStream, request, pushPromise.response)
      }
    }
  }

  private companion object {
    private const val CLIENT_AUTH_NONE = 0