HttpSession class abstract interface

The HttpRequest.session of an HttpRequest.

Stores arbitrary information about a browser session on the server. This information is stored in memory so it will be lost when the server exits.

A cookie named "DARTSESSID" is stored on the browser to associate the HttpSession with a particular client.

import 'dart:io';

void main() async {
  HttpServer.bind("localhost", 8080).then((server) {
    server.listen((request) {
      final session = request.session;
      if (session.isNew) {
        session["cart"] = [];
      }
      if (request.uri.queryParameters['buy'] != null) {
        final item = request.uri.queryParameters['buy'];
        session["cart"].add(item);
      }
      session["cart"].cast<String>().forEach(request.response.writeln);
      request.response.close();
    });
  });
}