Rails - Feb 2012 - delete a cookie when wrong password is entered in devise

How do you have control (in this case deleting a cookie) after devise
has determined that a user has entered the wrong password in the
latest version of devise. I have my own custom failure app but cookies
are not accessible within it:

class CustomFailureApp < Devise::FailureApp

  def respond
    unless request.format.to_sym == :html
      http_auth
    else
        store_location!
        flash[:alert] = i18n_message

        if request.subdomain == ''abc'' &&
i18n_message.includes?
(''Invalid login or password'')
          cookies.delete :tracker_for_external_clients


          uri = URI(''http://abc.com/?page_id=425'')
          params = { ''message'' => i18n_message }
          uri.query = URI.encode_www_form(params)

          res = Net::HTTP.get_response(uri)

          if res.is_a?(Net::HTTPSuccess)
            Rails.logger.info "The response is #{res.body}"
          else
            Rails.logger.info "Something went wrong"
          end

            redirect_to redirect_url
     end
  end

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