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I'm following rails 5.0 guide to configure action cable but I'm getting error on action cable connection here are contents of application.js

//= require cable
//= require_tree ./cable

I am getting following error.

WebSocket connection to 'ws://localhost:3000/cable' failed: Error during WebSocket handshake: Unexpected response code: 500

but if I add this in development.rb

 config.action_cable.url = 'ws://localhost:28080'

and I also need to run

bundle exec puma -p 28080 cable/config.ru

everything starts working. but why I need to todo all these why connection is not establishing on default url.

Asnad Atta
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