SpringBoot spring.codec.max-in-memory-size not used by server

We are setting spring.codec.max-in-memory-size and we expect (based on the documentation) that it will change the max possible size for server and client. I did a check and for the server it does not work - I set it to some small value:

spring:
  codec:
    max-in-memory-size: 10B

and just call our endpoint with json which is definitely bigger than 10B. It passes because it uses default 256KB. However, when we add custom config like:

@Configuration
public class CustomWebfluxConfiguration implements WebFluxConfigurer {

  @Override
  public void configureHttpMessageCodecs(ServerCodecConfigurer configurer) {
    configurer.defaultCodecs().maxInMemorySize(10);
  }
}

then I cannot post to my endpoint json which is bigger than 10B (so exactly what I expect). Why it does not work with the property as well like for the client?

We are using: spring-boot version 2.4.4 Netty server

Comment From: bclozel

Could you provide a sample application demonstrating the issue? Ideally, something we can git clone and run.

Thanks!

Comment From: abialas

I created a sample project with test and what surprised me - it works. I verified difference and the problem lied in the annotation we use EnableWebFlux which I understand disables WebFluxAutoConfiguration (where this property is used).

Comment From: bclozel

It looks like you've found where the problem comes from - this behavior is mentioned in the reference documentation.

I'm glad things are working now! Thanks!