code: def match(self, uri):
          
          absolute_uri = self.__absolute__(uri)
  
          return absolute_uri.startswith(self.__path__) and op.exists(absolute_uri)
docs: Check to see if this URI is retrievable by this Retriever implementation
  
          :param uri: the URI of the resource to be retrieved
          :type uri: str
          :return: True if it can be, False if not
          :rtype: bool