为什么在路由到 REST WebAPI 获取方法时需要内容类型 header？

Question

As the example code shown below, I am trying to access the get method by calling http://localhost:51292/API/MyWebAPI/GetData/?Name=John then I receive an error saying " The request contains an entity body but no Content-Type header. The inferred media type 'application/octet-stream' is not supported for this resource. "

public class MyData
{
    int ID { get; set; }
}
public class MyDataDTO : MyData
{
    string Name { get; set; }
}

public class MyWebAPIController : ApiController
{
    [AllowAnonymous]
    [HttpGet]
    public IHttpActionResult GetData(MyDataDTO publicInfo)
    {
        
        return Ok(publicInfo);
    }
}

I don't find any proper reason on why it requires the content type, maybe it has something to do with the API controller, or the routing? My routing is showen as below:

    HttpConfiguration config = new HttpConfiguration();

    config.Routes.MapHttpRoute(
        name: "DefaultApi",
        routeTemplate: "API/{controller}/{action}"
    );
    app.UseWebApi(config);

Answer 1

The solution was just to add [FromUri] before the MyDataDTO object type for the Get method, such:

[AllowAnonymous]
[HttpGet]
public IHttpActionResult GetData([FromUri] MyDataDTO publicInfo)
{
    
    return Ok(publicInfo);
}