title: How to cancel current request in interceptor - Angular 4
body: <p>As you know it's possible to use <strong>Interceptors</strong> in new versions of Angular 4.</p>
  <p>In mine, I want to cancel a request in interceptor in some conditions.
  So is it possible? Maybe what I should ask is: which way I should do that?</p>
  <p>It'll also be OK if I find a way to rewrite some response to the request instead of canceling it.</p>