Does anyone know how to deploy a rails app using https?

Hiya there! HTTPS is the most secure way , encrypted version of HTTP. If you'd like to migrate to HTTPS from HTTP, you're gonna have get a SSL certificate. Now, this process may or may not require for you to spend some cash. But there are few sites which provides free SSL certificates. My fave one is LetsEncrypt.

Now the second step would be to configure the web server to use the SSL certificate. Concatenate all SSL files and the private key using a Text Editor or use cat on UNIX. Since i mostly use Heroku for my server. Here is how its done using terminal:

$ heroku addons:create ssl:endpoint

Now install the SSL certificate using the private key and the full SSL bundle , which was originally composed by the certificate

$ heroku certs:add certificate_and_chain.pem private.key

The final step is to make some changes in the Rails's config file itself. In Rails >= 3.1 , there is a configuration flag called force_ssl. Dig into config/environments/production.rb , make the following change:

Rails.application.configure do |config|
  ......

  config.force_ssl = true
end

Restart your web server to apply the changes. If you're on Rails < 3.1 , you might wanna install rack_ssl gem and make some changes to your production configuration and you're good to go. I hope it helped!

~ Ari