code: def handle_existing_user(self, provider, user, access, info):
          "Login user and redirect."
          login(self.request, user)
          return redirect(self.get_login_redirect(provider, user, access)f handle_existing_user(self, provider, user, access, info):
          "Login user and redirect."
          login(self.request, user)
          return redirect(self.get_login_redirect(provider, user, access))
docs: Login user and redirect.