调用 Dingtalk.getAccessToken() 会得到 400 错误

[Mdxin]

包名：alibabacloud/dingtalk
文档地址：https://open.dingtalk.com/document/orgapp/obtain-the-access_token-of-an-internal-app

试图获取 accessToken 会得到如下错误：

[Missingbody]TeaUnableRetryError in OpenApiClient.php line 744
code: 400, body is mandatory for this action. request id:

经查看，发出请求的 content-type 是 application/x-www-form-urlencoded，但是https://api.dingtalk.com/v1.0/oauth2/accessToken接口似乎只接受json格式。