message: removed '/add' in service call
diff: @@ -37,8 +37,8 @@ export class UserService {
  .get(url);
  }
  - add(user: User): Observable<User[]> {
  - const url = userUrl + '/add';
  + add(user: User): Observable<User> {
  + const url = userUrl;
  return this.http
  .post(url, user, {headers: this.headers})
  .map((res: Response) => res.json())
  