I've read MSDN documentation of JsonRequestBehavior.AllowGet and many answers here at SO. I experimented and I am still confused.

I have the following action method. It works fine if I use POST method in my ajax call. It fails with status 404 (Resource not found) if I use GET method in my ajax call. So, the question is what exactly does the JsonRequestBehavior.AllowGet enum do in this Json method? The MSDN documentation says: AllowGet HTTP GET requests from the client are allowed. (https://msdn.microsoft.com/en-us/library/system.web.mvc.jsonrequestbehavior(v=vs.118).aspx), but then why does it fail when I use GET method in my ajax call? Changing the attribute from HttpPost to HttpGet does not help, it fails with either POST or GET method.

 [HttpPost]
    public JsonResult Create(Model m)
    {
        m.Ssn = "123-45-8999";
        m.FirstName = "Aron";
        m.LastName = "Henderson";
        m.Id = 1000;
        return Json(m, JsonRequestBehavior.AllowGet);
    }

    public class Model
    {
       public int Id { get; set; }
       public string Ssn { get; set; }
       public string FirstName { get; set; }
       public string LastName { get; set; }
    }

Here is my jQuery ajax call:

    $(function () {
        console.log("hola");

        $("button").on("click", function () {
            $.ajax({
                method: "POST", //Try changing this to GET and see.
                url: "Home/Create",
                data: { Id: 123, Ssn: "585-78-9981", FirstName: "John", LastName: "Smith" }
            })
    .done(function (msg) {
        alert("Data Saved: " + msg);

        });

  });

    })