code: func (c *Cache) Get(id string) (ItemInfo, io.ReadCloser, error) {
  	id = cleanID(id)
  
  	c.nlocker.Lock(id)
  	defer c.nlocker.Unlock(id)
  
  	info := ItemInfo{Name: id}
  
  	r := c.getOrRemove(id)
  
  	return info, r, nil
  }
docs: // Get gets the file with the given id from the cahce, nil if none found.