https://pub.dartlang.org/packages/http#-changelog-tab-
https://stackoverflow.com/questions/48477625/how-to-use-google-api-in-flutter/48485898#48485898

The library ‘package:http/http.dart’ doesn’t export a member with the shown name ‘IOClient’

Answer:

  
import 'package:http/io_client.dart';