Connecting to Server

Http service provides following methods...

<script src=“node_modules/angular2/bundles/http.dev.js”/>

API - /api/books

get() // get all/single resource
post() // add data to resource
put() // update the resource
patch() // partial update of resource 
delete() // delete resource
head() // get metadata of resource, want to just check existance of resource

Http Class

http.get(url).map(response => response.json());
http.post(url, JSON.stringify(obj)).map(response => response.json());

Using Http Class

Create Service

import {Http} from 'angular2/http';

@Injectable()
export class PostService
{
    constructor(private _http: Http) {}

    getPosts()
    {
        return this._http.get(url).map(res => res.json());
    }
}

Using the Service

import {HTTP_PROVIDERS} from 'angular2/core';

@Component({ 
    providers: [PostService, HTTP_PROVIDERS]
})

export class AppComponent implements OnInit {
    posts: any[];

    ngOnInit()
    { 
        this._postService.getPosts()
            .subscribe(posts => this.posts = posts);
    }
}

Note

HTTP_PROVIDERS includes all classes on which Http depends on

Adding Custom Request Headers

var headers = new Headers({
                        “key”: “value”
                    });

var options = new RequestOptions({
    headers: headers
});

http.get(url, options);