I have a Spring app in which I have different rest controllers.
I want to have a different WebFluxConfigurations for the different controllers.

For example, for the ‘configureHttpMessageCodecs’ I want to have different codecs based on the controller, or based on the URI.

And I also want to have different implementations for the ‘nettyCustomizer’ bean, and different ‘openApiInteractionValidator’ beans, again based on the controller/URI.

I understand that there is a way to do that by using a DelegatingWebFluxConfiguration, but I find very little documentation online in order to understand how to implement what I need.

What I tried doing so far is to have 2 implementations of the WebFluxConfigurer as such:

@Configuration

public class WorkflowWebFluxConfiguration implements WebFluxConfigurer {
@Override
    public void configureHttpMessageCodecs(ServerCodecConfigurer configurer) {
        // Register custom json encoder/decoders for both application/json and application/hal+json, using our own object
        // mapper.
        configurer.customCodecs()
            .registerWithDefaultConfig(new Jackson2JsonEncoder(workflowObjectMapper, MIME_TYPE_HAL, MimeTypeUtils.APPLICATION_JSON));
        configurer.customCodecs()
            .registerWithDefaultConfig(new Jackson2JsonDecoder(workflowObjectMapper, MIME_TYPE_HAL, MimeTypeUtils.APPLICATION_JSON));
    }

and:

@Configuration

public class ActivityWebFluxConfiguration implements WebFluxConfigurer {
 @Override
    public void configureHttpMessageCodecs(ServerCodecConfigurer configurer) {
        configurer.customCodecs().registerWithDefaultConfig(new Jackson2JsonEncoder(objectMapper, SUPPORTED_MIMETYPES));
        configurer.customCodecs().registerWithDefaultConfig(new Jackson2JsonDecoder(objectMapper, SUPPORTED_MIMETYPES));
    }
@Bean
    public WebServerFactoryCustomizer<NettyReactiveWebServerFactory> nettyCustomizer() {
        return factory -> factory
            .addServerCustomizers(httpServer -> httpServer.httpRequestDecoder(spec -> spec.maxInitialLineLength(MAX_URI_LENGTH)));
    }
@Bean
    public OpenApiInteractionValidator openApiInteractionValidator(
        @Value("classpath:apispecs/activity-v3.yaml") final Resource apiSpecification) throws IOException {

And I implemented this:

@Configuration
public class MainWebFluxConfiguration extends DelegatingWebFluxConfiguration {

    @Autowired
    public MainWebFluxConfiguration(WorkflowWebFluxConfiguration workflowWebFluxConfiguration,
        ActivityWebFluxConfiguration activityWebFluxConfiguration) {
        log.info("YYY main config web flux");
        this.setConfigurers(List.of(workflowWebFluxConfiguration, activityWebFluxConfiguration));
    }

}

But beyond that I dont understand how i route/point/configure each WebFluxConfiguration to handle specific URIs, or to map to a specific controller, or package, whichever way will work.

Any Help is so greatly appreciated.
Thanks!