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

@RVP's code will work, We can do one more thing for same.

add return only, it will also work

    intercept(req: HttpRequest, next: HttpHandler): Observable> {
          if(helper.isTokenExpired(tokenVal)){
              return;
          }
        .
        . <{code}>
        .

    }