request-interceptor.ts

 intercept(request: HttpRequest<any>, next: HttpHandler) {
    return from(this.storageService.getToken()).pipe(
      switchMap((token) => {
        if (token) {
          request = request.clone({
            headers: request.headers.set("Authorization", "Bearer " + token),
          });
        }
        request = request.clone({
          headers: request.headers.set("Accept", "application/json"),
        });
        return next.handle(request).pipe(
          map((event: HttpEvent<any>) => {
            if (event instanceof HttpResponse) {
            }
            return event;
          }),
          catchError((error: HttpErrorResponse) => {
            return throwError(error);
          })
        );
      })
    );
  }