Adding HttpAuthInterceptor to @NgModule

module.ts

export function getHttpAuth(backend: ConnectionBackend, defaultOptions: RequestOptions, storage: Storage) {
  return new HttpAuth(backend, defaultOptions, storage);
}

@NgModule({
  ...

  providers: [
    {
      provide: Http,
      useFactory: getHttpAuth,
      deps: [XHRBackend, RequestOptions, Storage]
    },
    ...
  ]

  ...
})