Heroku and Environments -domains are not working -

i finding managing production , staging env's on heroku painful process esp domains, git etc.

1) created app called htest.

2) in htest directory did below:

heroku create --app htest-staging --remote staging heroku create --app htest-production --remote production  heroku domains:add staging.mydomain.com --app htest-staging --remote staging heroku domains:add production.mydomain.com --app htest-production --remote production 

3) committed app , started service

git push staging master heroku ps --app htest-staging --remote staging 

3) add domain route53 cname of htest-staging.herokuapp.com

heroku info --app htest-staging === htest-staging web url:       http://htest-staging.herokuapp.com/ 

as expected web page not found.

what more troubling when go http://htest-staging.herokuapp.com/ on page:

heroku | welcome new app! refer documentation if need deploying. 

my python app should have said hello world.

so..how resolve?