Angular2 Http with RxJS Retry

// If this call fails, we'll try it again with the same payload two times
getFooBars(onNext: (fooBars: FooBar[]) => void) {
    this.get("api/foobar")
        .map(response => <FooBar[]>response.json())
        .retry(2)
        .subscribe(onNext,
                   error => 
                   console.log("An error occurred when requesting api/foobar.", error));
}