How to redirect to http-> https when SSL is enabled in Rails × Heroku environment

config/environments/production.rb


  # Force all access to the app over SSL, use Strict-Transport-Security, and use secure cookies.
  config.force_ssl = true #← Since this is commented out, just cancel it

Official documentation https://help.heroku.com/J2R1S4T8/can-heroku-force-an-application-to-use-ssl-tls

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