如何重写任何响应WebClient的HttpHeader？

import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpMethod;
import org.springframework.http.MediaType;
import org.springframework.http.client.reactive.ReactorClientHttpConnector;
import org.springframework.web.reactive.function.BodyInserters;
import org.springframework.web.reactive.function.client.WebClient;
import reactor.core.publisher.Mono;

public class WebClientExample {
    public static void main(String[] args) {
        WebClient webClient = WebClient.builder()
                .baseUrl("https://example.com")
                .defaultHeader(HttpHeaders.CONTENT_TYPE, MediaType.APPLICATION_JSON_VALUE)
                .build();

        Mono<String> response = webClient.method(HttpMethod.GET)
                .uri("/api/endpoint")
                .header(HttpHeaders.AUTHORIZATION, "Bearer token")
                .header(HttpHeaders.USER_AGENT, "Custom User Agent")
                .body(BodyInserters.fromValue("request body"))
                .retrieve()
                .bodyToMono(String.class);

        response.subscribe(System.out::println);
    }
}