Unknown SSL protocol error in connection with rails app on Heroku - ruby-on-rails

Question

I upgraded my Plan on Heroku to be able to use Heroku SSL, which includes Automated Certificate Management (ACM).
Hence when i run heroku certs:info I get:
Certificate details:
Common Name(s): www.myapp.fr
Expires At: 2018-04-29 10:10 UTC
Issuer: /C=US/O=Let's Encrypt/CN=Let's Encrypt Authority X3
Starts At: 2018-01-29 10:10 UTC
Subject: /CN=www.myapp.fr
SSL certificate is verified by a root authority.
or heroku certs:
Name Common Name(s) Expires Trusted Type
────────────────── ──────────────── ──────────────────── ─────── ────
tyrannosaurs-12099 www.myapp.fr 2018-04-29 10:10 UTC True ACM
However, my app still appears as being unsecured (no https) and when I run curl -kvI https://www.myapp.fr, here is what I get:
[2.3.4]
* Rebuilt URL to: https://www.myapp.fr/
* Trying 79.125.111.38...
* Connected to www.myapp.fr (79.125.111.38) port 443 (#0)
* Unknown SSL protocol error in connection to www.myapp.fr:-9838
* Closing connection 0
curl: (35) Unknown SSL protocol error in connection to www.myapp.fr:-9838
Any idea on How can I get my HTTPS working ?

Answer 1

I think I solved it at that time doing this: In order to force all clients to use https you will need to update your application to check for this. In Rails this is usually done by setting
config.force_ssl = true
in config/environments/production.rb.
Then wait a few minutes and it should be OK.