abstract class WebServer {
  static late WebServer _webServer;

  static WebServer getInstance() {
    return _webServer;
  }

  static void setInstance(WebServer server) {
    _webServer = server;
  }

  void start(int port);
  void stop();
  void addHandler(handler);
}

enum HttpMethod {
  GET,
  POST,
  PUT,
  DELETE,
  ALL,
  WS,
  ;
}

class RequestMapping {
  final HttpMethod method;
  final String path;

  const RequestMapping({this.method = HttpMethod.ALL, required this.path});
}