(function(webapi, $) {
    function safeAjax(ajaxOptions) {
      var deferredAjax = $.Deferred();
      shell.getTokenDeferred().done(function(token) {
        // add headers for ajax
        if (!ajaxOptions.headers) {
          $.extend(ajaxOptions, {
            headers: {
              "__RequestVerificationToken": token
            }
          });
        } else {
          ajaxOptions.headers["__RequestVerificationToken"] = token;
        }
        $.ajax(ajaxOptions)
          .done(function(data, textStatus, jqXHR) {
            validateLoginSession(data, textStatus, jqXHR, deferredAjax.resolve);
          }).fail(deferredAjax.reject); //ajax
      }).fail(function() {
        deferredAjax.rejectWith(this, arguments); // on token failure, pass the token ajax and args
      });
      return deferredAjax.promise();
    }
    webapi.safeAjax = safeAjax;
  })(window.webapi = window.webapi || {}, jQuery)