webflux session属性修改

org.springframework.web.server.session.WebSessionIdResolver

接口作为session的产生接口，默认为 cookie方式实现：

org.springframework.web.server.session.CookieWebSessionIdResolver

重新申明 此接口即可进行一些参数配置

    @Bean
    public WebSessionIdResolver webSessionIdResolver() {
        CookieWebSessionIdResolver resolver = new CookieWebSessionIdResolver();
        // 重写定义 cookie 名字
        resolver.setCookieName("GATEWAY-SESSION");
        return resolver;
    }