code: def head_object_async(self, path, **kwds):
      
      return self.do_request_async(self.api_url + path, 'HEAD', **kwds)
docs: HEAD an object.
  
      Depending on request headers, HEAD returns various object properties,
      e.g. Content-Length, Last-Modified, and ETag.
  
      Note: No payload argument is supported.