<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def _get_metadata(self):
 """Get header information and store as metadata for the endpoint."""

        self.metadata = self.fetch_header()
        self.variables = {g.name for g in self.metadata.grids}