how get the header's token

how get Headers angular with http

this.http.get(this._url, {search: params}).map((res: Response) => {
    if(res.headers && res.headers.get('Token')) {
        var token = res.headers.get('Token'); 
    }

    return res.json()
}).catch(function(error) {
    return Observable.throw(error.json());
});