    # File lib/fog/rackspace/dns.rb, line 75
            def initialize(options={})
              @rackspace_api_key = options[:rackspace_api_key]
              @rackspace_username = options[:rackspace_username]
              @rackspace_auth_url = options[:rackspace_auth_url]
              @connection_options = options[:connection_options] || {}
              uri = URI.parse(options[:rackspace_dns_endpoint] || US_ENDPOINT)

              @auth_token, @account_id = *authenticate
              @persistent = options[:persistent] || false
              @path       = "#{uri.path}/#{@account_id}"

              @connection_options[:headers] ||= {}
              @connection_options[:headers].merge!({ 'Content-Type' => 'application/json', 'X-Auth-Token' => @auth_token })

              @connection = Fog::Connection.new(uri.to_s, @persistent, @connection_options)
            end