intercept(request: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> {
    return next
      .handle(request)
      .pipe(
        map((event: HttpEvent<any>):any => {
          let type = this.convertTypeToString(event.type);
          if (type === "Response") {
            let error: HttpErrorResponse = new HttpErrorResponse({status: 500});
            return Observable.create(observer => observer.error(error));
          }
          return event;
        })
      );
}