我已经在AKS集群上部署了我的Flask应用程序，并使用Redis配置了flask会话后端。但是应用程序无法访问，它显示Internal Server Error。当我查看分离舱日志想了解更多信息时，我发现，

INFO:waitress:Serving on http://0.0.0.0:5000
ERROR:app:Exception on /login [GET]
Traceback (most recent call last):
  File "/usr/local/lib/python3.9/site-packages/flask/app.py", line 2529, in wsgi_app
    response = self.full_dispatch_request()
  File "/usr/local/lib/python3.9/site-packages/flask/app.py", line 1826, in full_dispatch_request
    return self.finalize_request(rv)
  File "/usr/local/lib/python3.9/site-packages/flask/app.py", line 1847, in finalize_request
    response = self.process_response(response)
  File "/usr/local/lib/python3.9/site-packages/flask/app.py", line 2344, in process_response
    self.session_interface.save_session(self, ctx.session, response)
  File "/usr/local/lib/python3.9/site-packages/flask_session/sessions.py", line 171, in save_session
    session_id = self._get_signer(app).sign(want_bytes(session.sid))
AttributeError: 'NoneType' object has no attribute 'sign'
ERROR:app:Request finalizing failed with an error while handling an error
Traceback (most recent call last):
  File "/usr/local/lib/python3.9/site-packages/flask/app.py", line 2529, in wsgi_app
    response = self.full_dispatch_request()
  File "/usr/local/lib/python3.9/site-packages/flask/app.py", line 1826, in full_dispatch_request
    return self.finalize_request(rv)
  File "/usr/local/lib/python3.9/site-packages/flask/app.py", line 1847, in finalize_request
    response = self.process_response(response)
  File "/usr/local/lib/python3.9/site-packages/flask/app.py", line 2344, in process_response
    self.session_interface.save_session(self, ctx.session, response)
  File "/usr/local/lib/python3.9/site-packages/flask_session/sessions.py", line 171, in save_session
    session_id = self._get_signer(app).sign(want_bytes(session.sid))
AttributeError: 'NoneType' object has no attribute 'sign'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/local/lib/python3.9/site-packages/flask/app.py", line 1847, in finalize_request
    response = self.process_response(response)
  File "/usr/local/lib/python3.9/site-packages/flask/app.py", line 2344, in process_response
    self.session_interface.save_session(self, ctx.session, response)
  File "/usr/local/lib/python3.9/site-packages/flask_session/sessions.py", line 171, in save_session
    session_id = self._get_signer(app).sign(want_bytes(session.sid))
AttributeError: 'NoneType' object has no attribute 'sign'
ERROR:app:Exception on /login [GET]
Traceback (most recent call last):
  File "/usr/local/lib/python3.9/site-packages/flask/app.py", line 2529, in wsgi_app
    response = self.full_dispatch_request()
  File "/usr/local/lib/python3.9/site-packages/flask/app.py", line 1826, in full_dispatch_request
    return self.finalize_request(rv)
  File "/usr/local/lib/python3.9/site-packages/flask/app.py", line 1847, in finalize_request
    response = self.process_response(response)
  File "/usr/local/lib/python3.9/site-packages/flask/app.py", line 2344, in process_response
    self.session_interface.save_session(self, ctx.session, response)
  File "/usr/local/lib/python3.9/site-packages/flask_session/sessions.py", line 171, in save_session
    session_id = self._get_signer(app).sign(want_bytes(session.sid))
AttributeError: 'NoneType' object has no attribute 'sign'
ERROR:app:Request finalizing failed with an error while handling an error
Traceback (most recent call last):
  File "/usr/local/lib/python3.9/site-packages/flask/app.py", line 2529, in wsgi_app
    response = self.full_dispatch_request()
  File "/usr/local/lib/python3.9/site-packages/flask/app.py", line 1826, in full_dispatch_request
    return self.finalize_request(rv)
  File "/usr/local/lib/python3.9/site-packages/flask/app.py", line 1847, in finalize_request
    response = self.process_response(response)
  File "/usr/local/lib/python3.9/site-packages/flask/app.py", line 2344, in process_response
    self.session_interface.save_session(self, ctx.session, response)
  File "/usr/local/lib/python3.9/site-packages/flask_session/sessions.py", line 171, in save_session
    session_id = self._get_signer(app).sign(want_bytes(session.sid))
AttributeError: 'NoneType' object has no attribute 'sign'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/local/lib/python3.9/site-packages/flask/app.py", line 1847, in finalize_request
    response = self.process_response(response)
  File "/usr/local/lib/python3.9/site-packages/flask/app.py", line 2344, in process_response
    self.session_interface.save_session(self, ctx.session, response)
  File "/usr/local/lib/python3.9/site-packages/flask_session/sessions.py", line 171, in save_session
    session_id = self._get_signer(app).sign(want_bytes(session.sid))
AttributeError: 'NoneType' object has no attribute 'sign'
ERROR:app:Exception on /login [GET]
Traceback (most recent call last):
  File "/usr/local/lib/python3.9/site-packages/flask/app.py", line 2529, in wsgi_app
    response = self.full_dispatch_request()
  File "/usr/local/lib/python3.9/site-packages/flask/app.py", line 1826, in full_dispatch_request
    return self.finalize_request(rv)
  File "/usr/local/lib/python3.9/site-packages/flask/app.py", line 1847, in finalize_request
    response = self.process_response(response)
  File "/usr/local/lib/python3.9/site-packages/flask/app.py", line 2344, in process_response
    self.session_interface.save_session(self, ctx.session, response)
  File "/usr/local/lib/python3.9/site-packages/flask_session/sessions.py", line 171, in save_session
    session_id = self._get_signer(app).sign(want_bytes(session.sid))
AttributeError: 'NoneType' object has no attribute 'sign'
ERROR:app:Request finalizing failed with an error while handling an error
Traceback (most recent call last):
  File "/usr/local/lib/python3.9/site-packages/flask/app.py", line 2529, in wsgi_app
    response = self.full_dispatch_request()
  File "/usr/local/lib/python3.9/site-packages/flask/app.py", line 1826, in full_dispatch_request
    return self.finalize_request(rv)
  File "/usr/local/lib/python3.9/site-packages/flask/app.py", line 1847, in finalize_request
    response = self.process_response(response)
  File "/usr/local/lib/python3.9/site-packages/flask/app.py", line 2344, in process_response
    self.session_interface.save_session(self, ctx.session, response)
  File "/usr/local/lib/python3.9/site-packages/flask_session/sessions.py", line 171, in save_session
    session_id = self._get_signer(app).sign(want_bytes(session.sid))
AttributeError: 'NoneType' object has no attribute 'sign'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/local/lib/python3.9/site-packages/flask/app.py", line 1847, in finalize_request
    response = self.process_response(response)
  File "/usr/local/lib/python3.9/site-packages/flask/app.py", line 2344, in process_response
    self.session_interface.save_session(self, ctx.session, response)
  File "/usr/local/lib/python3.9/site-packages/flask_session/sessions.py", line 171, in save_session
    session_id = self._get_signer(app).sign(want_bytes(session.sid))
AttributeError: 'NoneType' object has no attribute 'sign'

字符串
app_config.py个

SESSION_TYPE = "redis"
SESSION_PERMANENT = False
SESSION_USE_SIGNER = True
SESSION_REDIS = redis.Redis(host='redis-master', port=6379, password='XXXXX')

型
如何解决此问题？
因为它在本地环境中运行良好，配置为

SESSION_TYPE = "redis"
SESSION_PERMANENT = False
SESSION_USE_SIGNER = True
SESSION_REDIS = redis.from_url('redis://localhost:6379')

型
运行'redis-server'命令将启动redis服务器，我的应用程序能够从'http：//localhost：5000/login'访问它，没有任何问题。