How to log request and response bodies in Spring WebFlux

Question

I want to have centralised logging for requests and responses in my REST API on Spring WebFlux with Kotlin. So far I\'ve tried this approaches

@Bean
fun apiR         


        

Answer 1

Assuming we are dealing with a simple JSON or XML response, if debug level for corresponding loggers is not sufficient for some reason, one can use string representation before transforming it to object:

Mono mono = WebClient.create()
                               .post()
                               .body(Mono.just(request), Request.class)
                               .retrieve()
                               .bodyToMono(String.class)
                               .doOnNext(this::sideEffectWithResponseAsString)
                               .map(this::transformToResponse);

the following are the side-effect and transformation methods:

private void sideEffectWithResponseAsString(String response) { ... }
private Response transformToResponse(String response) { /*use Jackson or JAXB*/ }