How to use a non-www domain with heroku?

According to Heroku's documentation:

Zone apex domains (aka “naked” domains or “bare” domains), for example example.com, are not officially supported on Heroku apps, because DNS forbids CNAME records on the zone apex. However, some DNS hosts provide a way to get CNAME-like functionality at the zone apex.

For each provider, the setup is similar: point the ALIAS or ANAME entry for your apex domain to myapp.herokuapp.com, just as you would with a CNAME record.

Heroku's documentation mentioned these providers with "CNAME" support for zone apex:

• ANAME at DNS Made Easy
• ALIAS at DNSimple

Besides, these providers also work:

• CloudFlare
• {A}Record

And most DNS providers (such as ClouDNS and Namecheap FreeDNS) have free webhop / web redirect, so you don't need to setup your own web server for the redirect.

There is a simpler workaround.

Point your www CNAME to myapp.herokuapp.com

Then forward your root url (myapp.com) to www.myapp.com