Access-Control-Allow-Origin

XMLHttpRequest cannot load http://localhost:60712/api/Default. Request header field Access-Control-Allow-Origin is not allowed by Access-Control-Allow-Headers in preflight response.

running ng serve   http://localhost:4200/

Not sure what to do.  I just want to test for local development.

I did the npm install ember-cli-cors
I added Cors to mvc project.
my headers in my angularCli project looks like

constructor(private _http: Http) { }
  getUserAdminID(): Observable<any[]> {
        let headers = new Headers({ 'Content-Type': 'application/x-www-form-urlencoded; charset=UTF-8', 'Access-Control-Allow-Origin': '*',
'Access-Control-Allow-Credentials': 'false','Access-Control-Allow-Methods': 'GET,HEAD,OPTIONS,POST,PUT',
            'Access-Control-Allow-Headers': 'Access-Control-Allow-Headers, Origin,Accept, X-Requested-With, Content-Type, Access-Control-Request-Method, Content-Type' });

        let options = new RequestOptions({ headers: headers });
        return this._http.get(this._data, options)
            .map((response: Response) => <any[]>response.json())
             .catch((error: any) => Observable.throw(error.json().error ))//|| this.showError()
                .do(data => console.log('List: ' + JSON.stringify(data)));

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