# File lib/fog/aws/cloud_formation.rb, line 44
        def initialize(options={})
          require 'fog/core/parser'
          require 'json'

          @aws_access_key_id      = options[:aws_access_key_id]
          @aws_secret_access_key  = options[:aws_secret_access_key]
          @hmac       = Fog::HMAC.new('sha256', @aws_secret_access_key)

          options[:region] ||= 'us-east-1'
          @host = options[:host] || case options[:region]
          when 'ap-northeast-1'
            'cloudformation.ap-northeast-1.amazonaws.com'
          when 'ap-southeast-1'
            'cloudformation.ap-southeast-1.amazonaws.com'
          when 'eu-west-1'
            'cloudformation.eu-west-1.amazonaws.com'
          when 'us-east-1'
            'cloudformation.us-east-1.amazonaws.com'
          when 'us-west-1'
            'cloudformation.us-west-1.amazonaws.com'
          else
            raise ArgumentError, "Unknown region: #{options[:region].inspect}"
          end
          @path       = options[:path]      || '/'
          @port       = options[:port]      || 443
          @scheme     = options[:scheme]    || 'https'
          @connection = Fog::Connection.new("#{@scheme}://#{@host}:#{@port}#{@path}", options[:persistent])
        end