How to use/import http module?

import {bootstrap} from '@angular2/platform-browser-dynamic';import {Component, enableProdMode, Injectable, OnInit} from '@angular/core';import {Http, Headers, HTTP_PROVIDERS, URLSearchParams} from '@angular/http';import 'rxjs/add/operator/map';const API_KEY = '6c759d320ea37acf99ec363f678f73c0:14:74192489';@Injectable()class ArticleApi {  constructor(private http: Http) {}    seachArticle(query) {    const endpoint = 'http://api.nytimes.com/svc/search/v2/articlesearch.json';    const searchParams = new URLSearchParams()    searchParams.set('api-key', API_KEY);    searchParams.set('q', query);        return this.http      .get(endpoint, {search: searchParams})      .map(res => res.json().response.docs);  }    postExample(someData) {    const endpoint = 'https://your-endpoint';    const headers = new Headers({'Content-Type': 'application/json'});        return this.http      .post(endpoint, JSON.stringify(someData), { headers: headers })      .map(res => res.json());  }}@Component({  selector: 'app',  template: `<ul>                <li *ngFor="let article of articles | async"> {{article.headline.main}} </li>             </ul>`,   providers: [HTTP_PROVIDERS, ArticleApi],})class App implements OnInit {  constructor(private articleApi: ArticleApi) { }    ngOnInit() {    this.articles = this.articleApi.seachArticle('obama');  }}enableProdMode();bootstrap(App)  .catch(err => console.error(err));