Programmatically start a rack app

rack_boot.rb

require 'rack'

class RackApp
  def self.call(env)
    [200, {'Content-Type' => 'text/html'}, ['derp']]
  end
end

# For a full list of options, see
# http://www.ruby-doc.org/stdlib-1.9.3/libdoc/webrick/rdoc/WEBrick.html
options = {
  :Host => '127.0.0.1',
  :Port => '3000'
}

Rack::Handler::WEBrick.run(RackApp, options) do |server|
  [:INT, :TERM].each { |sig| trap(sig) { server.stop } }
end

@radfahrer WEBrick is part of the Ruby standard library, so it's always available. That's nice for test suites.