@Override
                    public Observable<HttpClientResponse<O>> call(HttpClientResponse<O> t1) {
                        if (t1.getStatus().code()/100 == 4 || t1.getStatus().code()/100 == 5)
                            return responseToErrorPolicy.call(t1, backoffStrategy.call(count.getAndIncrement()));
                        else
                            return Observable.just(t1);
                    }
Convert an HttpClientRequest to a ServerOperation 

@param request
@param rxClientConfig
@return
ribbon-transport/src/main/java/com/netflix/ribbon/transport/netty/http/LoadBalancingHttpClient.java