Send headers on GET request in Angular [duplicate]

I'm trying to send an http GET request and receiving a JSON response containing a list of users. I've developed a simple authentication process and, everytime a user does the login, an authorization token is stored in the Local Storage. I need to send the GET request with the token in the header of the request.

The result is a 401 - Unauthorized. My guess is that the token is not beeing sent, because it's the same error I get when I try to send the request without the token.

I've tried many different ways that I've found over the Internet, but, nothing so far.

Here's the service I use to get the list of users

import { RequestOptions, Headers } from '@angular/http';
import { User } from './../interfaces/user';
import { HttpClient, HttpHeaders } from '@angular/common/http';
import { Injectable, Inject } from "@angular/core";
import 'rxjs/add/operator/map';
import { Observable } from 'rxjs/Rx';

@Injectable()
export class UserService{
token: string;

constructor (private http: HttpClient) { }
getUsers(): Observable<any>{
    this.token = localStorage.getItem("auth-token");

    const header = new HttpHeaders();
        header.set('Authorization', 'Bearer '+ this.token),
        header.set('Content-Type', 'application/json'),
        header.set("Access-Control-Allow-Origin", "*");
        header.set("Access-Control-Allow-Credentials", "true");
        header.set("Access-Control-Allow-Methods", "GET,POST,OPTIONS,PUT,DELETE");
        header.set("Access-Control-Allow-Headers", "Access-Control-Allow-Headers, Origin,Accept, X-Requested-With, Authorization, Content-Type, Access-Control-Request-Method, Access-Control-Request-Headers");

    return this.http
        .get("http://localhost:50681/api/User", { headers: header })
        .map(res => console.log(res));
    }
}

I've allowed the CORS and everything needed on the backend.

Here's the error

Am I missing something? Any help is apreciated