Jquery POST 400错误请求

Can someone help me with this 400 bad request I'm getting? Here is my code:

saveBttn.click(function() {        
        var expireDate = $('#expire_date_picker').val();
        var newStatus = $('#User_email').val();
        if (expireDate.length > 0) {
            $.ajax({
                url: 'updateCases/',            
                data: {expireDate: expireDate, newStatus: newStatus },                
                type: 'POST',                
                success: function (data) {
                    alert("success!!");
                },
                error: function (XMLHttpRequest, textStatus, errorThrown) {
                    alert(errorThrown);
                }
            });
        }
    });

Its not even getting to the desired action...

Your parameter names in method must be same 'expireDate' and 'newStatus' respectively.If this is true,there should be problem in your url parameter

Set your data type and correct your parameters.

saveBttn.click(function() {        
        var expireDate = $('#expire_date_picker').val();
        var newStatus = $('#User_email').val();
        if (expireDate.length > 0) {
            $.ajax({
                dataType: "json",
                url: 'updateCases/',            
                data: {'expireDate': expireDate,'newStatus' : newStatus },                
                type: 'POST',                
                success: function (data) {
                    alert("success!!");
                },
                error: function (XMLHttpRequest, textStatus, errorThrown) {
                    alert(errorThrown);
                }
            });
        }
    });

try this

specify url with prefix '/'

     $.ajax({
            url: '/updateCases',            
            data: {expireDate: expireDate, newStatus: newStatus },                
            type: 'POST',                
            success: function (data) {
                alert("success!!");
            },
            error: function (XMLHttpRequest, textStatus, errorThrown) {
                alert(errorThrown);
            }
        });