code: def _auth_headers(self):
          
          if self.has_cookies():
              return [("Cookie", _make_cookie_header(list(self.get_cookies().items())))]
          elif self.basic and (self.username and self.password):
              token = 'Basic %s' % b64encode(("%s:%s" % (self.username, self.password)).encode('utf-8')).decode('ascii')
              return [("Authorization", token)]
          elif 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 or
          cookie, either provided explicitly or obtained by logging
          into the Splunk instance.
  
          :returns: A list of 2-tuples containing key and value