# File lib/aws/authorize_v2.rb, line 28
    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