httpexchange-spring-boot-starter

@HttpExchange("/orders")
public interface OrderApi {
    @GetExchange("/by_user/{userId}")
    List<OrderDTO> getOrdersByUserId(@PathVariable("userId") String userId);
}

public interface PostApi {
  @GetExchange("/posts")
  List<Post> findAll(@BeanParam Post condition);
}

interface RepositoryService {
    @GetExchange("/repos/{owner}/{repo}")
    Repository getRepository(@PathVariable String owner, @PathVariable String repo);
}

@Configuration
class RepositoryServiceConfiguration {
    @Bean
    public RepositoryService repositoryService(RestClient.Builder restClientBuilder) {
        RestClient restClient = RestClient.builder().baseUrl("https://api.github.com/").build();
        RestClientAdapter adapter = RestClientAdapter.create(restClient);
        HttpServiceProxyFactory factory = HttpServiceProxyFactory.builderFor(adapter).build();
        return factory.createClient(RepositoryService.class);
    }
}

@Bean
HttpServiceArgumentResolver yourHttpServiceArgumentResolver() {
  return new YourHttpServiceArgumentResolver();
}

// For RestClient
@Bean
HttpClientCustomizer.RestClientCustomizer restClientCustomizer() {
    return (restClientBuilder, channel) -> {
        if (Objects.equals(channel.getName(), "whichChannelYouWantToCustomize")) {
            var httpClient = HttpClient.newBuilder().build();
            restClientBuilder.requestFactory(new JdkClientHttpRequestFactory(httpClient));
        }
    };
}

// For WebClient
@Bean
HttpClientCustomizer.WebClientCustomizer webClientCustomizer() {
    return (webClientBuilder, channel) -> {
        if (Objects.equals(channel.getName(), "whichChannelYouWantToCustomize")) {
            var httpClient = HttpClient.newBuilder().build();
            webClientBuilder.clientConnector(new JdkClientHttpConnector(httpClient));
        }
    };
}

http-exchange:
  refresh:
    enabled: true

@HttpExchange("${api.post.url}")
@Validated
public interface PostApi {
    @GetExchange("/typicode/demo/posts/{id}")
    Post getPost(@PathVariable("id") @Min(1) @Max(3) int id);
}

implementation("org.springframework.cloud:spring-cloud-starter-loadbalancer")