code: def get(self, path):
      
  
      logging.debug("request to download: %s", path)
      # If the file is large, we want to abandon downloading
      # if user cancels the requests.
      # pylint: disable=attribute-defined-outside-init
      self.connection_closed = False
  
      self.set_header("Content-Disposition", "attachment")
      if not utils.check_path(path):
        self.write("Only relative paths are allowed")
        self.set_status(403)
        self.finish()
        return
  
      if path is None or not os.path.isfile(path):
        self.write("File %s  not found" % path)
        self.set_status(404)
        self.finish()
        return
  
      length = int(4 * 1024 * 1024)
      offset = int(0)
      while True:
        data = utils.read_chunk(path, offset=offset, length=length, escape_data=False)
        if self.connection_closed or 'data' not in data or len(data['data']) < length:
          break
        offset += length
        self.write(data['data'])
        self.flush()
  
      if 'data' in data:
        self.write(data['data'])
      self.finish()
docs: get method