What happened:

Server return an error with response code 400

{
    "code": 400,
    "reason": "CODEC",
    "message": "unregister Content-Type: ",
    "metadata": {}
}

What you expected to happen:

Response success

How to reproduce it (as minimally and precisely as possible):

1. install kratos
2. create project
3. add post or put method with empty message
4. run project
5. Send post/put request with empty body

Anything else we need to know?:

no

Environment:

• Kratos version (use kratos -v):

  kratos version v2.8.4

• Go version (use go version):

  go version go1.24.2 windows/amd64

• OS (e.g: cat /etc/os-release):

  版本 Windows 11 专业版
  版本号 24H2
  安装日期 ‎2025/‎1/‎13
  操作系统版本 26100.3775
  体验 Windows 功能体验包 1000.26100.66.0

• Others: