How to handle http redirect to login with Ajax and HTML

var originalXhr; //Before jquery does it's processing.

$.ajax({
  type: "POST",
  url: link,
  xhr: function () {
    originalXhr = jQuery.ajaxSettings.xhr();
    return originalXhr;
  },
  data: value,
  success: function(data, status, xhr) {
          url = originalXhr.responseURL
          lastSegment = url.split('/').pop()
          if (lastSegment == "login"){
            window.location.replace("/login");
          }else{
            $(replace).html(data);
          }
      },
  dataType: "html"
});