# File lib/rack/perftools_profiler/profile_once.rb, line 36
    def delete_custom_params(env)
      # I used to clone the env, but it broke any apps that used Warden
      # ex) new_env = env.clone
      new_env = env
      
      get_params = Rack::Request.new(new_env).GET
      get_params.delete('profile')
      get_params.delete('times')
      get_params.delete('printer')
      get_params.delete('ignore')
      get_params.delete('focus')

      new_env.delete('rack.request.query_string')
      new_env.delete('rack.request.query_hash')

      new_env['QUERY_STRING'] = build_query(get_params)
      new_env
    end