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Tutorial Using WebSockets on Heroku with Node.js

Este código se corresponde con la sección: Option 2: Socket.io que muestra como usar websockets en Heroku utilizando el módulo Socket.io

Repo heroku-examples/node-socket.io

Aquí es esencial habilitar session affinity:

[~/local/src/javascript/learning/websockets/websockets-heroku-socket-io(master)]$ heroku features:enable http-session-affinity
Enabling http-session-affinity for ⬢ dsi-socket-io-example... done

Session affinity, sometimes referred to as sticky sessions, is a platform feature that associates all HTTP requests coming from an end-user with a single application instance (web dyno).