@GetMapping("/")
    Mono<String> index() {
        return webClient.get()
                        .uri("/hello")
                        .retrieve()
                        .bodyToMono(String.class);
    }
Returns a string which is retrieved from {@code /hello} using the {@link WebClient}.
examples/spring-boot-webflux/src/main/java/example/springframework/boot/webflux/HelloController.java