HerokuHeader

Rack middleware that will insert Heroku's navigation header on a specified subdomain.

Installation

Add this line to your application's Gemfile:

gem 'heroku_header'

And then execute:

$ bundle

Or install it yourself as:

$ gem install heroku_header

HerokuHeader::MiddleWare takes a few config options, all optional:

:subdomain => The subdomain to show the header on, defaults to heroku.
:timeout => How many seconds until the request to get the header is cancelled, default is 5. (It fails silently when it can't fetch the header).
:cache => This expects an object which conforms to the ActiveSupport::Cache::Store API. It is not reccomended to leave this out, in which case the header will be fetched from Heroku on each request (when required).
:cache_key => This is the key which is used to store and retrieve the header from :cache. Defaults to 'heroku_header_html'.

# application.rb
config.middleware.use HerokuHeader::MiddleWare, :subdomain => 'heroku', :timeout => 5, :cache => lambda { Rails.cache }

require 'sinatra'

use HerokuHeader::MiddleWare, :subdomain => 'heroku', :timeout => 5

get '/' do
  ....
end