Angular 2 forbidden error 403

my question is this: -Because I receive error 403 in firebug when wanting to represent an image ?. The application is being made with MEAN Stack.

getArtist(token, id: string){
        let headers = new Headers({
            'Content-Type' : 'application/json',
            'Authorization': token
        });
        let options = new RequestOptions({headers: headers});
        return this._http.get(this.url + 'getOneArtist/'+ id, options).map(res => res.json());
    }

That is the method for the artist service. And I want to put your corresponding image. The fact is that in principle everything has gone well so far, since I have headers in the back-end. CORS.

<div class="image-for-edit" *ngIf="artist.image && artist.image != 'null'">
    <img src="{{url + 'getImageArtist/' + artist.image}}">
</div>

Here is the HTML.

And finally, the controller method:

getArtist(){
    this._route.params.forEach((params: Params) => {
        let id = params['id'];

        this._artistService.getArtist(this.token, id).subscribe(
            response => {
                if(!response.artist) {
                    this._router.navigate(['/']);
                }else{
                    this.artist = response.artist;
                }
            },
            error => {
                var errorMessage = <any>error;
                if(errorMessage != null) {
                    console.log(error);
                }   
            }
        );
    });
}

Any clue as to why all the places where I want to put an image have not had a problem, and here?

Thanks in advance. Greetings.