Facebooker Cucumber Workaround

# Add this file in config/initializers
module ActionController
  module Integration
    class Session
      private
        # Get a temporary URL writer object
        def generic_url_rewriter
          env = {
            'REQUEST_METHOD' => "GET",
            'QUERY_STRING' => "",
            "REQUEST_URI" => "/",
            "HTTP_HOST" => host,
            "SERVER_PORT" => https? ? "443" : "80",
            "HTTPS" => https? ? "on" : "off",
            "rack.input" => StringIO.new
          }
          UrlRewriter.new(Request.new(env), {})
        end
    end
  end
end

This is a workaround for the Missing rack.input (RuntimeError) when trying to use Cucumber and Facebooker with Rails 2.3.8 / Rack >= 1.1.0.
See https://rails.lighthouseapp.com/projects/8994/tickets/5029-rackinput-for-generic_url_rewriter