I have a Rails 3.2 app on Heroku.

It accepts wildcards and subdomains, so each user can have a vanity
subdomain, such as a.app.com, b.app.com, etc.

What I want to do is let a user point example.com to a.app.com.

What would I have to change in the example.com DNS config to make this
work? And what do I change in my app?

I am guessing example.com is just a CNAME for a.app.com. But how does
my app know what to do -- it needs to know that example.com is really
a.app.com. I suppose I could tell the app that -- the user could
configure it.

Just trying to figure out the proxy madness for this... since
a.app.com is a proxy to app.heroku.com. Does example.com have to be a
proxy to app.heroku.com? I am guessing that wont work.

Any ideas would be awesome.

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