I\'m following a tutorial in Portuguese that teaches how to build your first Ionic application.
After installing npm, node.js, angular, Ionic and Cordova using last vers
Use the below code
import {HTTP_PROVIDERS} from '@angular/http'; provider : [ HTTP_PROVIDERS, .... ]
The above answer was deprecated since angular4. However As I said in the comment,
import { HttpModule } from '@angular/http'; imports: [ HttpModule ]