消息推送带emoji文案，签名错误

求助各位大佬！

Java客户端调用Upush推送，body带emoji，接口返回2027 签名错误的错误码。

当request body中没有emoji时则签名正确，没有问题

使用Apache的签名库 DigestUtils.md5Hex() 方法计算签名

request body

{"appKey":"","timestamp":1659427127274,"type":"unicast","payload":{"body":{"custom":{"userId":6878630708848673920,"msgType":"TEST","title":"Hello world","subtitle":"hello world","content":"Go rockers! 🚀","jumpLink":"","createTime":1659455924736,"extra":{"test":"test"}}},"display_type":"message"},"device_tokens":""}

代码示例

return DigestUtils.md5Hex(
    (HttpMethod.POST.name()
        + properties.getDomain()
        + toJson(payload)
        + uPushMeta.getAppMasterSecret()).getBytes(StandardCharsets.UTF_8)