issue

client.dart

getJsonResponse(String target, Map params) {
    params.addAll({
        'client_id':this.client_id, 'api_key':this.api_key
    });
    var url = new Uri.http(API_HOST, target, params);

    var client = new HttpClient();
    client.userAgent = 'DoD v1.0';
    print(url);
    var url2 = Uri.parse('http://google.com');
    return client.getUrl(url).then((HttpRequest req) {
      req.headers.add('content-type', 'application/json');
      return req.close();

    }).then((HttpResponse resp) {


      var json = '';
      if (resp.statusCode == 200) {
        resp.transform(UTF8.decoder) // use a UTF8.decoder
        .listen((String data) => json = json + data, // output the data
        onError: (error) => print("UNABLE TO CONNECT"), onDone:() {
          
          print(json); // works fine
          return json; // not working
          
        });
      }
    });
  }