Sample RESTful service for use with Angular 2:

import { Injectable } from '@angular/core';
import { Http, Response, Headers } from '@angular/http';
import 'rxjs/add/operator/map'
import { Observable } from 'rxjs/Observable';

/*
database User table structure:
    ID INTEGER NOT NULL, AUTOINCREMENT
    NAME VARCHAR(50) NOT NULL
    PHONE VARCHAR(20) NOT NULL
*/

export class User {
    public id:number;
    public name:string;
    public phone:string;
}

@Injectable()
export class UserService {

    private actionUrl: string;
    private headers: Headers;

//
// sample url for a web service ==> "http://somesite.com/user/"
//

    constructor(private http: Http, url:string) {

        this.actionUrl = url;

        this.headers = new Headers();
        this.headers.append('Content-Type', 'application/json');
        this.headers.append('Accept', 'application/json');
    }

    public GetUsers = (): Observable<Response> => {
        return this.http.get(this.actionUrl).map(res => res.json());
    }

    public GetUser = (id: number): Observable<Response> => {
        return this.http.get(this.actionUrl + id).map(res => res.json());
    }

    public InsertUser = (user: User): Observable<Response> => {
        var toAdd = JSON.stringify({ User: user });

        return this.http.post(this.actionUrl, toAdd, 
                    { headers: this.headers }).map(res => res.json());
    }

    public UpdateUser = (id: number, itemToUpdate: User): Observable<Response> => {
        return this.http.put(this.actionUrl + id, JSON.stringify(itemToUpdate), 
                    { headers: this.headers }).map(res => res.json());
    }

    public DeleteUser = (id: number): Observable<Response> => {
        return this.http.delete(this.actionUrl + id);
    }
}