docs: function taskMinus() {
        taskCounter--
        if (taskCounter === 0) {
          // Time to respond
          if (files.length === 0) {
            res.send(200, {
              result: 'no files to upload',
              files
            })
          } else {
            res.send(201, {
              result: 'upload OK',
              files
            })
          }
          next()
        }
      }