/**
     * Sets content description returned when entering URL of "/server/status"
     *
     * @param name - Name of individual requesting server status
     * @return decorated {@link DetailedBaseStatus} object
     */
    @RequestMapping("/disk/status")
    public DiskStatus diskStatusHandler(@RequestParam(value = "name") String name) {
        checkNameParams(name);

        DiskStatusCommand cmd = new DiskStatusCommand(counter.incrementAndGet(),String.format(template,name));
        SmartExecutor executor = new SmartExecutor(cmd);
        executor.handleCommand();

        return cmd.getStatus();
    }

executor.handleCommand()方法调用需要花费很长时间来处理。它将格式化的json返回到浏览器。

在executor.handleCommand()仍在处理中的情况下，如何向浏览器返回一条消息（也许是格式化的json）？