@GetMapping("/cbError")
	public Mono<String> cbError() {
		String code = "500";
		return WebClient.builder().baseUrl("http://httpbin.org/").build().get()
				.uri("/status/" + code).retrieve().bodyToMono(String.class)
				.transform(it -> circuitBreakerFactory.create("cbError").run(it, t -> {
					t.printStackTrace();
					return Mono.just("fallback");
				}));
	}
@author <a href="mailto:fangjian0423@gmail.com">Jim</a>
spring-cloud-alibaba-examples/sentinel-example/sentinel-webflux-example/src/main/java/com/alibaba/cloud/examples/SentinelWebFluxController.java