in example/server.dart [12:21]
void main() async {
var handler = SseHandler(Uri.parse('/sseHandler'));
await io.serve(handler.handler, 'localhost', 0);
var connections = handler.connections;
while (await connections.hasNext) {
var connection = await connections.next;
connection.sink.add('foo');
connection.stream.listen(print);
}
}