Trace HTTP headers & cookies

trace.rb

# config/application.rb

config.middleware.use "Loggo"

class Loggo
  def initialize(app)
    @app = app
  end
  def call(env)
    request = ActionDispatch::Request.new(env)
    puts request.cookies
    puts env.select {|k,v| k.start_with? 'HTTP_'}
    @app.call(env)
  end
end