使用Spring Boot2 WebClient，以线程安全/按请求的方式，如何发送每个请求的diff报头？

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-webflux</artifactId>
</dependency>

WebClient webClient = WebClient.builder().build();

Mono<String> response = webClient.get()
        .uri("http://example.com/api/endpoint")
        .header("diff", "true")
        .retrieve()
        .bodyToMono(String.class);

response.subscribe(result -> {
    // 处理响应结果
    System.out.println(result);
}, error -> {
    // 处理请求错误
    System.err.println("Request error: " + error.getMessage());
});