Configure a reverse proxy on Heroku Bamboo stack

I have a Heroku-hosted site that needs to make AJAX requests to a non-Heroku subdomain. In the non-Heroku past I've done th开发者_如何学编程is with a reverse proxy (to sub.my.domain ) in Apache in order to overcome the browser security model.

I'd like to avoid code changes (e.g. switch to JSONP) at this point. How do I set up a reverse proxy on Heroku, or do you think another option is best like creating a reverse proxy elsewhere and proxying both main and sub domains?

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