【Flutter】ネットワークアクセス

class _MyHomePageState extends State<MyHomePage> {
  final _controller = TextEditingController();
  static const host = 'baconipsum.com';
  static const path = '/api/?type=meat-and-filler&paras=1&format=text';

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Home'),
      ),
      body: Padding(
        padding: EdgeInsets.all(20.0),
        child:Column(
          children:<Widget> [
               Text('INTERNET ACCESS',
               style: TextStyle(fontSize: 32,
               fontWeight: ui.FontWeight.w500),
               ),
              Padding(padding: EdgeInsets.all(10.0)),
              TextField(
                controller: _controller,
                style: TextStyle(fontSize: 24),
                minLines: 1,
                maxLines: 5,
              ),
              ],
            ),
          ),
          floatingActionButton: FloatingActionButton(
            child: Icon(Icons.open_in_new),
            onPressed: () {
              getData();
              showDialog(
                context: context,
                builder: (BuildContext context) =>
                    AlertDialog(
                      title: Text("loaded!"),
                      content: Text("get content from URI."),
                    )
              );
            }
          )
    );
  }

  void getData() async {
    var http = await HttpClient();
    HttpClientRequest request = await http.get(host, 80, path);
    HttpClientResponse response = await request.close();
    final value = await response.transform(utf8.decoder).join();
    _controller.text = value;
  }
}

  void setData() async {
    final ob = {
      "title": "foo",
      "author": "hoge",
      "content": "this is content.サンプルコンテンツ"
    };
    final jsondata = json.encode(ob);
    var https = await HttpClient();
    HttpClientRequest request = await https.postUrl(Uri.parse(url));
    request.headers.set(HttpHeaders.contentTypeHeader, "application/json; charset=UTF-8");
    request.write(jsondata);
    HttpClientResponse response = await request.close();
    final value = await response.transform(utf8.decoder).join();
    _controller.text = value;
  }