AppEngine Python 502 错误网关 - 导入错误：无法从“itsdangerous”导入名称“json”

Question

Last Friday I uploaded a new version of my application to App Engine. It was working before, but now I get a 502 Bad Gateway. If I go into the AppEngine console and direct traffic to an older version it works fine. So, I must have changed something, but what?

I pulled the logs and the following caught my attention:

"/layers/google.python.pip/pip/lib/python3.9/site-packages/flask/json/ init .py", line 15, in from itsdangerous import json as _json ImportError: cannot import name 'json' from 'itsdangerous' (/layers/google.python.pip/pip/lib/python3.9/site-packages/itsdangerous/ init .py)

My requirements file is here:

Flask==1.1.4
google-cloud-datastore==1.12.0
requests==2.24.0

And my import sections are like this:

from flask import Blueprint, render_template
from flask import session, redirect, url_for, escape, request
from google.cloud import datastore

Any ideas where I can look?

Answer 1

As indicated in the comment above, the issue was resolved by upgrading from Flask 1.1.2 to Flask 2.0.3