How can I get Heroku's SSL functionality, certs:auto, to work for my non-www domain? - ssl

Question

Supposedly, this command should automagically setup SSL for your domain:
heroku certs:auto:enable
This worked fine for my domain "www.example.io" but not "example.io". Is there something special I have to do for this? Here's the output:
➜ ExamPleGit.clean git:(master) heroku certs:auto
=== Automatic Certificate Management is enabled on example
Certificate details:
Common Name(s): www.example.io
Expires At: 2018-01-22 15:04 UTC
Issuer: /C=US/O=Let's Encrypt/CN=Let's Encrypt Authority X3
Starts At: 2017-10-24 15:04 UTC
Subject: /CN=www.example.io
SSL certificate is verified by a root authority.
Domain Status
────────────── ────────────
www.example.io DNS Verified
example.io Failing
=== Some domains are failing validation, please verify that your DNS matches: heroku domains
➜ ExamPleGit.clean git:(master) heroku domains
=== example Heroku Domain
example.herokuapp.com
=== example Custom Domains
Domain Name DNS Record Type DNS Target
────────────── ─────────────── ────────────────────────────
www.example.io CNAME www.example.io.herokudns.com
example.io ALIAS or ANAME example.io.herokudns.com

Answer 1

The way I fixed this was to simply redirect all traffic from example.io -> www.example.io in my domain providers control panel, so I didn't need to worry about SSL for that URL. For Namecheap, go to the Advanced DNS settings of your domain and add this entry:
URL Redirect Record # http://www.example.io/
Once that is done, then you can then setup node or PHP (via .htaccess file) to force all http -> https and give yourself an SSL secure site.