如何使用HandlerFilterFunction转发请求？

import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.web.reactive.function.server.HandlerFilterFunction;
import org.springframework.web.reactive.function.server.ServerRequest;
import org.springframework.web.reactive.function.server.ServerResponse;
import reactor.core.publisher.Mono;

public class MyHandlerFilterFunction implements HandlerFilterFunction<ServerResponse, ServerResponse> {

    @Override
    public Mono<ServerResponse> filter(ServerRequest request, HandlerFunction<ServerResponse> next) {
        // 对请求进行处理，例如修改请求参数、添加请求头等操作
        ServerHttpRequest modifiedRequest = request.exchange().getRequest().mutate()
                .header("X-Custom-Header", "Custom Value")
                .build();

        // 创建一个新的 ServerRequest 对象，并设置新的处理器或路由
        ServerRequest modifiedServerRequest = ServerRequest.from(request.exchange()).request(modifiedRequest).build();

        // 处理请求，并返回响应
        return next.handle(modifiedServerRequest);
    }
}