asp.net mvc jQuery $.post works but $.get doesn't

Why would POST work but not GET? I'm not using [AcceptVerbs(HttpVerbs.Post)]. I'm calling this:

public ActionResult GetTest(string key)
        {
            var test = new { HelpTest = key };
            return Json(test);
        }

And it works when I do this:

$.post("/Home/GetTest", { key: options.key },
                        function(helpTest) {
                            alert(helpTest.HelpTest);
                        });  

But not this:

$.get("/Home/GetTest", { key: options.key },
                            function(helpTest) {
                                alert(helpTest.HelpTest);
                            });  

Why would this be? Using GET returns an XMLHttpRequest.status of 50开发者_如何学编程0. What am I confused about?

that is because return json does not return json to get requests it is unsafe and you should avoid it but if you really want to use it use the overload of json set the property to allowget then it will work

return Json(data, JsonRequestBehavior.AllowGet);