Spring boot RestClient H2C 설정

@Configuration
public class RestClientConfig {

    @Value("${...}")
    private String baseUrl;

    @Bean
    public RestClient restClient() {
        return RestClient.builder()
                .requestFactory(new JdkClientHttpRequestFactory(
                        HttpClient.newBuilder()
                                .version(HttpClient.Version.HTTP_2)
                                .build()
                ))
                .baseUrl(baseUrl)
                .defaultHeader("Content-Type", MediaType.APPLICATION_JSON_VALUE)
                .build();
    }
}