Replay an AJAX request if the first one failed due to an authentication error

gistfile1.js

jQuery.ajaxSetup(
  statusCode: {
    403: function() {
      // This calls a backbone view that renders a login window, then 
      // calls the success function one the user has been authenticated
      // The call back simply re-runs $.ajax using the current context object,
      // which conveniently is a hash of the original AJAX request params.

      var sessionLogin = new SessionsLoginView();
      var context = this;
      sessionLogin.render({
        success: function() {
          $.ajax(context);
        }
      });
    }
  }
});