title: angular2 Property 'append' does not exist on type 'Headers'
body: <pre><code>import { Http, Headers } from '@angular/http';
     export class LoginComponent implements OnInit {
        let headers: Headers = new Headers();
        headers.append('Content-Type','application/json');}
  </code></pre>
  
  <p>I get the following error for the above code.</p>
  
  <blockquote>
    <p>'append' error: Property 'append' does not exist on type 'Headers'.</p>
  </blockquote>
  
  <p>How to solve it?</p>