spring cloud gateway全局过滤器实现向request header中放数据

exchange.getRequest().getHeaders().set(); 

@Component
public class AuthSignatureFilter implements GlobalFilter, Ordered { 
    static Logger logger = LoggerFactory.getLogger(AuthSignatureFilter.class);
 
    /**
     * 全局过滤器 核心方法
     * @param exchange
     * @param chain
     * @return
     */
    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        logger.info("request = {}",JSONArray.toJSONString( exchange.getRequest()) );
        String token = exchange.getRequest().getQueryParams().getFirst("authToken");
        //向headers中放文件，记得build
        ServerHttpRequest host = exchange.getRequest().mutate().header("a", "888").build();
        //将现在的request 变成 change对象 
        ServerWebExchange build = exchange.mutate().request(host).build();
        return chain.filter(build);
    }
 
    @Override
    public int getOrder() {
        return -200;
    }
}

 Consumer<HttpHeaders> httpHeaders = httpHeader -> {
            httpHeader.set("aaaa", "bbb");
            httpHeader.set("xxx", "cc");
            httpHeader.set("bbxx", "bbbx");
            httpHeader.set("aaaa", "bbb");
        };
        ServerHttpRequest serverHttpRequest = exchange.getRequest().mutate().headers(httpHeaders).build();
        exchange.mutate().request(serverHttpRequest).build();