The requested built-in library is not available on Dartium.'package:http/src/io_client.dart'

[damondouglas]

Version 0.11.3+11 seemed to introduce this error. How I suspect this is described below.

1. Using stagehand simple-web, I scaffold a simple web application.
2. I add http: "0.11.3+9" as a dependency and import 'package:http/browser_client.dart';
3. The following code runs with no error:

main() async {
  var client = new BrowserClient();
  var response =
      await client.get('data.json');
  print('Response status: ${response.statusCode}');
  print('Response body: ${response.body}');
}

4. Changing dependency to http: "0.11.3+11" and re-running pub get yields the following error in the Dartium console:

The requested built-in library is not available on Dartium.'package:http/src/io_client.dart': error: line 6 pos 1: library handler failed
import 'dart:io';
^: package:http/src/io_client.dart

[zoechi]

>=0.11.3+11 uses a new language feature that ignores dart:io imports in the browser.
It looks like you need a newer Dart version

See also the changelog https://pub.dartlang.org/packages/http for 0.11.3+11

[damondouglas]

The following are the versions of dart and Dartium.

$ dart --version
Dart VM version: 1.23.0 (Fri Apr 21 03:07:31 2017) on "macos_x64"

and Dartium: Version 45.0.2454.104 (64-bit)

Thank you, @zoechi for your help :)

[nex3]

I think you need to update your Dartium version.