# File lib/chef/knife/cookbook_delete.rb, line 81
      def available_versions
        @available_versions ||= rest.get_rest("cookbooks/#{@cookbook_name}").values.flatten
      rescue Net::HTTPServerException => e
        if e.to_s =~ /^404/
          Chef::Log.error("Cannot find a cookbook named #{@cookbook_name} to delete")
          nil
        else
          raise
        end
      end