In the Angular 2 documentation, they provide examples that also use HTTP for communication.
import { HTTP_PROVIDERS } from '@angular/http';
import { HeroService } from './hero.service';
@Component({
selector: 'my-toh',
template: `
<hero-list></hero-list>
`,
directives: [HeroListComponent],
providers: [
HTTP_PROVIDERS,
HeroService,
]
})
Service providers play a crucial role in creating instances for injection purposes. For instance, to inject an Http instance, you must define the HTTP_PROVIDERS where the provider for the Http type is contained.
A key concept to grasp is that Angular2 introduces hierarchical injectors for dependency injection. This means that each component has its own associated injector, and the current injector is a child injector of the parent component's injector.
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