Error with http.post and http.get with angular2

Good problem with sending and fetching data with angle2

Auth.ts

import {Observable} from 'rxjs/Observable';
import {Injectable} from "angular2/core";
import {Http, Response} from "angular2/http";

if (!localStorage.getItem('token')) {
localStorage.setItem('token', 'false');
}
function fdsfds() {
if (localStorage.getItem('token') == 'true') {
return true;
}else{
return false;
}
}
@Injectable()
export class Auth {
loggedIn: any;
result: Object;

  constructor(http:Http) {
    this.loggedIn = fdsfds();

    this.result = {friends:[]};

    http.get('oii.json').map((res: Response) => res.json()).subscribe(res => this.result = res);

  }

  login() {
    localStorage.setItem('token', 'true');
    this.loggedIn = fdsfds();

  }

  logout() {
    localStorage.setItem('token', 'false');
    this.loggedIn = fdsfds();
  }

  check() {
    return Observable.of(this.loggedIn);
  }
}