We recently moved our class sign-up to EventBrite.  It used to be hosted on heroku with the subdomain classes.blazingcloud.net.  However, when we changed our DNS to direct to eventbrite, it didn’t end up targetting our eventbrite subdomain: blazingcloud.eventbrite.com — hitting the EventBrite homepage instead.  Rack to the rescue!

We set up another Heroku app with just a one-line rack application.  All it needed was a rackup config file, called “config.ru” with the following line:

and voila! It does a simple re-direct to the new site.