How to set HTTP status code from ASP.NET MVC 3?

Solution 1:

There is extended discussion at What is the proper way to send an HTTP 404 response from an ASP.NET MVC action?

What you want to do is set Response.StatusCode instead of adding a Header.

public ActionResult TestError(string id) // id = error code
{
    Response.StatusCode = 400; // Replace .AddHeader
    var error = new Error();  // Create class Error() w/ prop
    error.ErrorID = 123;
    error.Level = 2;
    error.Message = "You broke the Internet!";

    return Json(error, JsonRequestBehavior.AllowGet);
}

Solution 2:

If all you want to return is the error code, you could do the following:

public ActionResult TestError(string id) // id = error code 
{ 
      return new HttpStatusCodeResult(id, "You broke the Internet!");
}

Reference: MSDN article on Mvc.HttpStatusCodeResult.

Otherwise, if you want to return other information use

Response.StatusCode = id

instead of

Response.AddHeader("Status Code", id); 

Solution 3:

If you can't get your json result into your view, try to add this :

Response.TrySkipIisCustomErrors = true;

Before this :

Response.StatusCode = 400;

More details on this post : https://stackoverflow.com/a/37313866/9223103