Heroku supports Rack and Rack-based web frameworks like Sinatra, Ramaze, and Camping. To run a Rack-based app, include a Gemfile, as well as a rackup file named config.ru in the app’s root directory. The config.ru file convention has become couire changes to deploy to Heroku. Pure Rack apps First, ite a
> gem install emfile in the root of your app specifying what gems are required to run it: source "https://rubygems.org" gem 'sinatra', '4.0' Add this file to the git repository since it’s part of the app. Also add the .itignore file. After adding the Gemfile, it makes it easy for other developers to get their environment ready to run the app:
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