Webflux: Microservice A POST to Microservice B - spring-boot

Question

I guess my answer is already on this forum (because I read), but I can not understand my concern ...
I want microservice A to send a POST to microservice B.
microserviceA:
webClientBuilder.build().post().uri("http://localhost:9644/relever/add")
.contentType(MediaType.APPLICATION_JSON)
.body(Mono.just(releve), Web.class)
.retrieve()
.bodyToMono(Web.class);
microservice B (controller):
#RestController
#RequestMapping("/relever")
public class ReleverController {
#PostMapping("/add")
#ResponseStatus(HttpStatus.CREATED)
public void AjouteDunRelever(Relever relever) {
System.out.println("ok!!!");
}
}
When I use POSTMAN in POST mode to http://localhost:9644/relever/add, microservice B reacts, but when microservice A post to microservice B, microservice B does not react, ... why?
thank you!

Answer 1

I think you need to set the baseUrl before building the client.
Try
webClientBuilder.baseUrl("http://localhost:9644").build().post().uri("/relever/add")
.contentType(MediaType.APPLICATION_JSON)
.body(Mono.just(releve), Web.class)
.retrieve()
.bodyToMono(Web.class);
WebClient.create(baseUrl) is basically just doing that for you.
From: org.springframework.web.reactive.function.client.WebClient
* Variant of {#link #create()} that accepts a default base URL. For more
* details see {#link Builder#baseUrl(String) Builder.baseUrl(String)}.
* #param baseUrl the base URI for all requests
* #see #builder()
*/
static WebClient create(String baseUrl) {
return new DefaultWebClientBuilder().baseUrl(baseUrl).build();
}

Answer 2

I changed the baseurl to localhost and with the microservice name, no reaction!
webClientBuilder.baseUrl("http://localhost:9644").build().post().uri("/relever/add")
.body(Mono.just(releve), Web.class)
.accept(MediaType.APPLICATION_JSON)
.exchange()
.flatMap(response -> {
System.out.println(response.statusCode());
System.out.println(); **<---- Breakpoint Here**
return response.bodyToMono(Web.class);
});
at the top of my class I do this:
#Autowired
private WebClient.Builder webClientBuilder;
and in another package I load the loadbalancer
#Configuration
public class Config {
private static final org.apache.logging.log4j.Logger logger
= LogManager.getLogger(Config.class.getName());
#Bean
#LoadBalanced
public WebClient.Builder loadBalancedWebClientBuilder() {
return WebClient.builder();
}
}
The breakpoint doesn't even stop (so it never goes into flatmap), and no reaction in the microserviceB controller
Thank you