debugging in the console

gistfile1.txt

class SimpleViz
  def initialize(app, &lookup)
    @app = app
  end
  def call(env)
    puts caller
    request = Rack::Request.new(env)
    puts "-> #{request.request_method.upcase} (#{request.url})"
    status, headers, body = @app.call(env)
    puts "<--#{status}-- #{body.size}"
    [status, headers, body]
  end
end
Rack::Client::Simple.middlewares << SimpleViz