Spring Cloud Openfeign feign.codec.EncodeException when page is changed before API requests are completed

Describe the bug Context: I'm using Spring Cloud 2020.0.1 and Spring Boot 2.4.3

Scenario:

Frontend app calls an API on Service 1
This API calls another bunch of APIs of Service 2 using Spring Cloud OpenFeign

Everythings works as expected, but if the frontend app (a simple SPA) changes page before the API returns, in the backend logs an error is thrown:

feign.codec.EncodeException: Couldn't serialize object createdAt: DESC\n\tat org.springframework.cloud.openfeign.support.SortJsonComponent$SortSerializer.lambda$serialize$0(SortJsonComponent.java:54)
java.lang.IllegalStateException: UT010019: Response already commited

Sample

My feign client declaration:

@FeignClient(
        name = "${myclientName}",
        fallbackFactory = MyClientFallbackFactory.class
)
public interface MyClient {
       @GetMapping(path = "items/{id}", produces = APPLICATION_JSON_VALUE)
    ItemDto getItem(@PathVariable UUID id, @RequestParam String myParam);
}

My feign configuration:

@Configuration
@EnableFeignClients
public class FeignConfig {

    @Autowired
    private ObjectFactory<HttpMessageConverters> messageConverters;

    @Bean
    public Encoder feignEncoder() {
        return new SpringFormEncoder(new SpringEncoder(messageConverters));
    }

    @Bean
    public Module pageJacksonModule() {
        return new PageJacksonModule();
    }

    @Bean
    public Module sortJacksonModule() {
        return new SortJacksonModule();
    }

}

This seems to happen only from when I upgraded to Spring Cloud 2020.0.1 from HOXTON.SR9

Comment From: giangur

Update: to workaround the issue I've changed the API of service 2 to reduce the number of API calls, but I'm still curious to understand why there's this problem.

Comment From: OlgaMaciaszek

@giangur please provide a minimal, complete, verifiable example that reproduces the issue.

Comment From: spring-cloud-issues

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Comment From: spring-cloud-issues

Closing due to lack of requested feedback. If you would like us to look at this issue, please provide the requested information and we will re-open the issue.