関連ワード:  request failed with status code 599    jupyterhub api_request to the proxy failed with status code 599    jupyterhub api_request to the proxy failed with status code 599 retrying    599 status code    http status code 599    request failed with status code 499    request failed with status code 504    request failed with status code 405  
結果 : request failed with status code 599