title: angular 6 or 7: How to import RequestOptions and ResponseContentType in '@angular/common/http'
body: <p>I have migrated angular 4 code to angular 6 and I want to know how to import below code in angular 6 or 7?</p>
  
  <pre><code>import { RequestOptions, ResponseContentType } from '@angular/common/http';
  </code></pre>