Unable to render this definition
The provided definition does not specify a valid version field.
Please indicate a valid Swagger or OpenAPI version field. Supported version fields are swagger: "2.0" and those that match openapi: 3.0.n (for example, openapi: 3.0.0).
错误原因：Controller 的 public 方法没有指定 HttpMethodAttribute
解决：设置为 HttpGet 或者 HttpPost