# File lib/openid/server.rb, line 358
      def answer(assoc)
        response = OpenIDResponse.new(self)
        response.fields.update_args(OPENID_NS, {
            'expires_in' => sprintf('%d', assoc.expires_in()),
            'assoc_type' => @assoc_type,
            'assoc_handle' => assoc.handle,
            })
        response.fields.update_args(OPENID_NS,
                                   @session.answer(assoc.secret))
        if @session.session_type != 'no-encryption'
          response.fields.set_arg(
              OPENID_NS, 'session_type', @session.session_type)
        end

        return response
      end