Spring Controller + Ajax返回String

我想从返回的字符串Spring MVC Controller来Ajax.它没有按预期工作并给出错误.

我的Ajax代码:

function ajaxRequest(item) {

    $.ajax({
        type: "POST",
        url: "/myPage",
        data: {
           item: item
        },
        success: function (html) {

            alert(html);
        },
        error: function(e) {
            console.log("Error:" + e);
        }
    });

}

我的控制器:

@RequestMapping(value = "/myPage", method= RequestMethod.POST, produces="text/plain")
public @ResponseBody String myController(HttpServletRequest request) {
String myItem = request.getParameter("item");   

...

return myItem + "bla bla bla";
}

Chrome控制台结果:

POST http://localhost:8080/myPage 406 (Not Acceptable) jquery.js
Error:[object XMLHttpRequest] 

我在这里失踪了什么？