    # File lib/fog/rackspace/load_balancers.rb, line 148
            def authenticate
              options = {
                :rackspace_api_key  => @rackspace_api_key,
                :rackspace_username => @rackspace_username,
                :rackspace_auth_url => @rackspace_auth_url
              }
              credentials = Fog::Rackspace.authenticate(options, @connection_options)
              @auth_token = credentials['X-Auth-Token']
              account_id = credentials['X-Server-Management-Url'].match(/.*\/([\d]+)$/)[1]
              @path = "#{@path}/#{account_id}"
            end