How to point a custom domain to a Heroku subdomain?

2
votes

Is it possible to allow users to use their own custom domains to point to a specific Heroku subdomain? I'm using wildcard subdomains that allow my app to use abc.myapp.com URL's. Could a user add myuser.com and point to that? How can this be done?

Trying to add CNAME to point there returns Heroku | No such app messages and when I add the custom domain to the Heroku Dashboard it just points to the top level domain.

DETAILED STEPS:

CNAME mydomain.com ---> myapp.herokuapp.com -- works fine

CNAME anotherdomain.com ---> sub.mydomain.com -- not working

If I add anotherdomain.com to the Heroku dashboard then:

CNAME anotherdomain.com ---> sub.mydomain.com or mydomain.com -- works fine but opens the root domain mydomain.com in either cases

So I guess the only way to serve the proper subdomain is to handle it inside my app, so that anotherdomain.com in the db corresponds to sub.mydomain.com and serve the proper page.

1
herokusubdomaincname

1 Answers

3
votes

In your app's code, you need to configure that new domain to point to your app.
This is what you would manually be doing with the heroku domains:add command.

Using heroku's Platform API, you can perform this programmatically.