问tts业务传参错误？

返回参数错误，但我真不知道哪里错{"Response":{"Error":{"Code":"InvalidParameter","Message":"Url key and value should be splited by `=`."},"RequestId":"cb1e7a67-0c98-4322-b593-22a3d2ae5964"}}

我的公共参数是：

Authorization:TC3-HMAC-SHA256 Credential=*************************/2023-02-11/tts/tc3_request

, SignedHeaders=content-type;host

, Signature=*************************************

Content-Type: application/json

Host: tts.tencentcloudapi.com

X-TC-Action: TextToVoice

X-TC-Version: 2019-08-23

X-TC-Timestamp: 1676089647

X-TC-Region: ap-shanghai

业务参数是：

{"Text":"娴嬭瘯鍚堟垚鏂囨湰","SessionId":"id-1234","VoiceType":101019}

错误消息是Url key and value should be splited by `=`

他说业务参数必须是等号？问题是，开发文档写的是JSON格式提交啊？