import 'dart:async'; import 'package:event_source/event_source.dart'; final events = EventSource(Uri.parse('http://api.example.com/ssedemo.php')); // Listening on the `events` stream will open a connection. final subscription = events.events.listen((MessageEvent message) { print('${message.name}: ${message.data}'); }); Timer(Duration(seconds: 30), () { // Canceling the subscription closes the connection. subscription.cancel(); });