# File lib/fog/rackspace/block_storage.rb, line 100
        def authenticate(options={})
          super({
            :rackspace_api_key => @rackspace_api_key,
            :rackspace_username => @rackspace_username,
            :rackspace_auth_url => @rackspace_auth_url,
            :connection_options => @connection_options
          })
        end