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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 appâs root directory. The config.ru file convention has become common, so most existing Rack applications should not require changes to deploy to Heroku. Pure Rack apps First, create a new directory and write a simple conf
> gem install bundler Create a file named Gemfile 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 itâs part of the app. Also add the .bundle directory to your .gitignore 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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