[Dart] HTTP GET(ing) a cloud function

httprequest.dart

import 'dart:io';
import 'dart:convert';

class HttpRequestClass {
    void fetchAndDisplay() {
        HttpClient()
            .getUrl(Uri.parse('https://us-central1-hunt-primary.cloudfunctions.net/pruoo?n=5'))
            .then((request) => request.close())
            .then((response) => response.transform(Utf8Decoder()).listen(print));
    }
}

void main() {
    HttpRequestClass httpRequestClass = new HttpRequestClass();
    httpRequestClass.fetchAndDisplay();
}