Localhost gem for SSL(https) connection in the Rails development environment.

Gemfile

gem 'rails'
gem 'puma'

# 1. Add localhost gem.
group(:development) do 
  gem 'localhost'
end

puma.rb

# config/puma.rb

# 2. Add SSL bind setting
require 'localhost/authority'
authority = Localhost::Authority.fetch

ssl_bind '127.0.0.1', '3001', {
  key: authority.key_path,
  cert: authority.certificate_path
}

# 3. Comment out this line
# port ENV.fetch("PORT") { 3000 }

terminal

$ rails server
=> Booting Puma
=> Rails 7.0.0 application starting in development
=> Run `bin/rails server --help` for more startup options
Puma starting in single mode...
* Puma version: 5.5.2 (ruby 3.0.2-p107) ("Zawgyi")
*  Min threads: 5
*  Max threads: 5
*  Environment: development
*          PID: 79764
* Listening on ssl://127.0.0.1:3000?cert=/Users/kseki/.localhost/localhost.crt&key=/Users/kseki/.localhost/localhost.key&verify_mode=none
Use Ctrl-C to stop