init method

Implementation

@override
Future<void> init() async {
  if (_subscription != null) {
    return;
  }
  if (_server == null) {
    final context = securityContext;
    _server = context == null
        ? await HttpServer.bind(serverAddress, port)
        : await HttpServer.bindSecure(serverAddress, port, context);
  }
  _run();
  _onOpen.add(null);
}