How to cancel current request in interceptor - Angular 4

Question

As you know it\'s possible to use Interceptors in new versions of Angular 4.

In mine, I want to cancel a request in interceptor in some conditions. So i

Answer 1

This is just a slight variant of RVP's answer

import { NEVER } from 'rxjs';

intercept(request: HttpRequest, next: HttpHandler): Observable> {
  if (stopThisRequest) {
    return NEVER;
  }

  return next.handle(request);
}

I used NEVER instead of EMPTY to avoid dealing with undefined values in my subscriptions (or promises).

Use NEVER if you don't want your subscription callback to be invoked