# File lib/aws/authorize_v3.rb, line 27
    def add_authorization! signer
      self.access_key_id = signer.access_key_id
      parts = []
      parts << "AWS3-HTTPS AWSAccessKeyId=#{access_key_id}"
      parts << "Algorithm=HmacSHA256"
      parts << "Signature=#{signer.sign(string_to_sign)}"
      headers['x-amzn-authorization'] = parts.join(',')
    end