class_docstr: Resolve anything that's hosted under detectron2's namespace.
code: def _get_supported_prefixes(self):
      return [self.PREFIX]
  
imports: from iopath.common.file_io import HTTPURLHandler, OneDrivePathHandler, PathHandler
  from iopath.common.file_io import PathManager
label_desc: Use image node_id 1 for calling the Detectron2Handler obj's underlying member method code with example usage: obj._get_supported_prefixes() and returns: list