auto-respond-to.rb

## Pseudo auto-respond-to in Sinatra. 

module Sinatra
  module AutoRespondTo
    def self.registered(app)
      app.after do
        case request.accept.first
        when "application/json"
          body { body.to_json }
        when "application/xml"
          ...
        end
      end
    end
  end
  register AutoRespondTo
end