rack-heroku_env

A gem that provides exposing Heroku environment variables as HTTP response headers as rack middleware.

Rack::HerokuEnv exposes any HTTP_X_HEROKU* as X-Heroku-*.

For example:

• HTTP_X_HEROKU_DYNOS_IN_USE as X-Heroku-Dynos-In-Use
• HTTP_X_HEROKU_QUEUE_DEPTH as X-Heroku-Queue-Depth
• HTTP_X_HEROKU_QUEUE_WAIT_TIME as X-Heroku-Queue-Wait-Time

Usage

Rails 3

# Gemfile
gem 'rack-heroku_env', :require => 'rack/heroku_env'

# config/application.rb
config.middleware.use Rack::HerokuEnv

Sinatra

require 'rack/heroku_env'
use Rack::HerokuEnv

Installation

$ gem install rack-heroku_env

Testing

$ gem install bundler
$ bundle install
$ bundle exec rake