    # File lib/fog/atmos/models/storage/files.rb, line 52
            def head(key, options = {})
              requires :directory
              data = service.head_namespace(directory.key + key, :parse => false)
              file_data = data.headers.merge({
                :body => data.body,
                :key => key
              })
              new(file_data)
            rescue Fog::Storage::Atmos::NotFound
              nil
            end