import { HttpClient } from '@angular/common/http';
import { HttpHeaders } from '@angular/common/http';

requestToken() {
 let headers = new HttpHeaders();
 headers = headers.set('Accept', 'application/json');

 return this.http.post(this.configUrl + '/token', headers);
}

getToken() {
 this.service.requestToken().subscribe( res => {
 console.log(res);
 }, error => {
   console.log(error);
 });
}