for - Angular 2: Ningún proveedor para ConnectionBackend

error: staticinjectorerror(appmodule)[http-> connectionbackend]:

Question

Obtenga este "No hay proveedor para ConnectionBackend!" error al tratar de usar http con una promesa.

main.ts

// ... tl;dr import a bunch of stuff

platformBrowserDynamic().bootstrapModule(MyModule);

myModule.ts

// ... tl;dr import a bunch of stuff

@NgModule({
 declarations: [
        PostComponent
  ],
  providers: [
    Actions,
    MyService,
    Http
  ],
  imports: [
    ...
  ],
  bootstrap: [MyComponent]
})

myComponent.ts

import { Component, OnInit } from ''@angular/core'';
import {ActivatedRoute, Router} from ''@angular/router'';
import {Observable} from ''rxjs/Observable'';
import {MyService} from ''./../services/myService''
import {Post} from ''./post'';

@Component({
  templateUrl: ''post.component.html'',
  styleUrls: [''post.component.css'']
})
export class MyComponent implements OnInit {
  post: Observable<Post>;
  postId : Number;

  constructor(private route: ActivatedRoute, private router: Router, private service:MyService) {

  }


  ngOnInit() {
    this.route.params.subscribe(params => {
      this.postId = +params[''id''];
      this.post = this.service.getPostById(this.postId);
    });
  }

}

myService.ts

import {Injectable} from "@angular/core"
import {Http} from ''@angular/http'';
import {Observable} from ''rxjs/Observable'';
import {Post} from ''./../post/post'';
import ''rxjs/Rx''

@Injectable()
export class MyService {

    endpoint_url:String = "http://someurl.com/";

    constructor(private http: Http){
    }

    getPostById (id:Number) : Observable<Post> {
        return this.http.get(this.endpoint_url + id.toString()).map(res => res.json());
    }
}

Todo se ve bien pero luego me sale este error:

error_handler.js:51Error: Uncaught (in promise): Error: Error in ./MyComponent class MyComponent_Host - inline template:0:0 caused by: No provider for ConnectionBackend!
at resolvePromise (zone.js:429)
at zone.js:406
...

Y aquí están los documentos para ConnectionBackend . ¿Creo que solo necesito agregar algo a los providers en myModule ?

Answer 1

Importe el HttpModule en su módulo en lugar de registrar Http como proveedor.

import {HttpModule} from ''@angular/http'';

@NgModule({
 imports: [HttpModule], 
 declarations: [
        PostComponent
  ],
  providers: [
    Actions,
    MyService

  ],
  bootstrap: [MyComponent]
})

El HttpModule registra proveedores para todos sus servicios.