code: def perform_authentication(self):
          
  
          if not self.authenticators:
              return
  
          request.user = None
          request.auth = None
  
          for authenticator in self.authenticators:
              auth_tuple = authenticator.authenticate()
  
              if auth_tuple:
                  request.user = auth_tuple[0]
                  request.auth = auth_tuple[1]
                  break
docs: Perform authentication on the incoming request.