code: def _auth_headers(self):
          
          if self.token is _NoAuthenticationToken:
              return []
          else:
              # Ensure the token is properly formatted
              if self.token.startswith('Splunk '):
                  token = self.token
              else:
                  token = 'Splunk %s' % self.token
              return [("Authorization", token)]
docs: Headers required to authenticate a request.
  
          Assumes your ``Context`` already has a authentication token,
          either provided explicitly or obtained by logging into the
          Splunk instance.
  
          :returns: A list of 2-tuples containing key and value