Django handling expired session (for ajax request)

ajax-setup.js

$.ajaxSetup({
    complete: function(xhr, status) {
        if(xhr.status == 278) {
            if (xhr.responseJSON) {
                var data = xhr.responseJSON;
                if (!data.success && data.error_message) {
                    alert(data.error_message);
                }
            }

            setTimeout(function() {
                window.location = xhr.responseJSON.redirect_to;
            }, 2000);
        }
    }
});

middlewares.py

from django.contrib import messages
from django.http import HttpResponseRedirect, JsonResponse
from django.urls.base import reverse
from django.utils.translation import gettext as _
from django.utils.deprecation import MiddlewareMixin


class AjaxRedirectHandlerMiddleware(MiddlewareMixin):
    """
    Middleware for AJAX redirects in Django.
    """

    def process_response(self, request, response):
        # If session expired, Django will send HttpResponseRedirect to login page.
        if request.is_ajax() and type(response) == HttpResponseRedirect:
            if not request.user.is_authenticated:
                # Show an additional message on login page after redirect.
                messages.error(request, _('Session expired. Please login again.'))

                response = JsonResponse(data={
                    'success': False,
                    'error_message' _('Session expired')},
                    'redirect_to': reverse('account:login'),
                })
            
                response.status_code = 278

        return response