JQuery for basic authentication random behavior?
function make_basic_auth(un, pss)
{
    var tok = un + ':' + pss;
    var hash = Base64.encode(tok);
    return "Basic " + hash;
}

$('#loginform').submit(function()
{
        var username = $('.username').val();
        var password = $('.passcode').val();

        $.ajax({
            type: 'POST',
            url: 'serverIP/loginService',
            contentType: "application/json",
            **async: false**,
            beforeSend: function(xhr)
            {
                var auth = make_basic_auth(username, password);
                xhr.setRequestHeader('Authorization',  auth);
            },
            success: function (xhr, status){
                alert(status);
            },
            error: function (xhr, status){
                alert(status);
            }
       });
});