railties/lib/rails/generators/rails/app/templates/config/cable.yml


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# Action Cable uses Redis by default to administer connections, channels, and sending/receiving messages over the WebSocket.
production:
  adapter: redis
  url: redis://localhost:6379/1

development:
  adapter: redis
  url: redis://localhost:6379/2

test:
  adapter: redis
  url: redis://localhost:6379/3