code: def get_current_user(self):
          
          if 'Authorization' in self.headers:
              match = self.access_key_regex.search(self.headers['Authorization'])
              if match:
                  return match.group(1)
  
          if self.querystring.get('AWSAccessKeyId'):
              return self.querystring.get('AWSAccessKeyId')
          else:
              # Should we raise an unauthorized exception instead?
              return '111122223333'
docs: Returns the access key id used in this request as the current user id