问Asp.Net核心不引人注目的Ajax在实时服务器上抛出400错误

EN

 <form id="addform" asp-area="Admin" asp-controller="Departments" asp-action="Add" data-ajax="true" data-ajax-method="post" data-ajax-success="onSuccess" data-ajax-failure="onFailure" data-ajax-begin="onBegin">
</form>

$(document).ajaxSend(function (e, xhr, options) {
    debugger;
    if (options.type.toUpperCase() == "POST") {
        var token = $("input[name='__RequestVerificationToken']").val();
        xhr.setRequestHeader("__RequestVerificationToken", token);
    }
});

[HttpPost]
[ValidateAntiForgeryToken]
public async Task<IActionResult> Add(DepartmentViewModel departmentViewModel)
{
     return View();
}