# File lib/aws/core/authorize_v2.rb, line 29
      def add_authorization! signer
        self.access_key_id = signer.access_key_id
        add_param('AWSAccessKeyId', access_key_id)
        add_param('SignatureVersion', '2')
        add_param('SignatureMethod', 'HmacSHA256')
        add_param('Signature', signer.sign(string_to_sign))
      end