Azure auth - token expired error.

[kknd4eva]

Hi there. I've implemented flask dance on a python website running via AWS Elastic Beanstalk. Initial authentication works fine, however after a period of time the token expires, and I get the below errors (500 server error on the site). I would have expected an expired token would redirect the user to login again?

[Mon Sep 30 01:16:56.209088 2019] [:error] [pid 2778] [remote 172.31.0.71:136] [2019-09-30 01:16:56,207] ERROR in app: Exception on / [GET]
[Mon Sep 30 01:16:56.209131 2019] [:error] [pid 2778] [remote 172.31.0.71:136] Traceback (most recent call last):
[Mon Sep 30 01:16:56.209135 2019] [:error] [pid 2778] [remote 172.31.0.71:136]   File "/opt/python/run/venv/local/lib/python3.6/site-packages/flask/app.py", line 2446, in wsgi_app
[Mon Sep 30 01:16:56.209138 2019] [:error] [pid 2778] [remote 172.31.0.71:136]     response = self.full_dispatch_request()
[Mon Sep 30 01:16:56.209142 2019] [:error] [pid 2778] [remote 172.31.0.71:136]   File "/opt/python/run/venv/local/lib/python3.6/site-packages/flask/app.py", line 1951, in full_dispatch_request
[Mon Sep 30 01:16:56.209145 2019] [:error] [pid 2778] [remote 172.31.0.71:136]     rv = self.handle_user_exception(e)
[Mon Sep 30 01:16:56.209148 2019] [:error] [pid 2778] [remote 172.31.0.71:136]   File "/opt/python/run/venv/local/lib/python3.6/site-packages/flask/app.py", line 1820, in handle_user_exception
[Mon Sep 30 01:16:56.209152 2019] [:error] [pid 2778] [remote 172.31.0.71:136]     reraise(exc_type, exc_value, tb)
[Mon Sep 30 01:16:56.209155 2019] [:error] [pid 2778] [remote 172.31.0.71:136]   File "/opt/python/run/venv/local/lib/python3.6/site-packages/flask/_compat.py", line 39, in reraise
[Mon Sep 30 01:16:56.209165 2019] [:error] [pid 2778] [remote 172.31.0.71:136]     raise value
[Mon Sep 30 01:16:56.209168 2019] [:error] [pid 2778] [remote 172.31.0.71:136]   File "/opt/python/run/venv/local/lib/python3.6/site-packages/flask/app.py", line 1949, in full_dispatch_request
[Mon Sep 30 01:16:56.209171 2019] [:error] [pid 2778] [remote 172.31.0.71:136]     rv = self.dispatch_request()
[Mon Sep 30 01:16:56.209174 2019] [:error] [pid 2778] [remote 172.31.0.71:136]   File "/opt/python/run/venv/local/lib/python3.6/site-packages/flask/app.py", line 1935, in dispatch_request
[Mon Sep 30 01:16:56.209177 2019] [:error] [pid 2778] [remote 172.31.0.71:136]     return self.view_functions[rule.endpoint](**req.view_args)
[Mon Sep 30 01:16:56.209180 2019] [:error] [pid 2778] [remote 172.31.0.71:136]   File "/opt/python/current/app/application.py", line 32, in index
[Mon Sep 30 01:16:56.209183 2019] [:error] [pid 2778] [remote 172.31.0.71:136]     resp = azure.get("/v1.0/me")
[Mon Sep 30 01:16:56.209186 2019] [:error] [pid 2778] [remote 172.31.0.71:136]   File "/opt/python/run/venv/local/lib/python3.6/site-packages/requests/sessions.py", line 546, in get
[Mon Sep 30 01:16:56.209188 2019] [:error] [pid 2778] [remote 172.31.0.71:136]     return self.request('GET', url, **kwargs)
[Mon Sep 30 01:16:56.209191 2019] [:error] [pid 2778] [remote 172.31.0.71:136]   File "/opt/python/run/venv/local/lib/python3.6/site-packages/flask_dance/consumer/requests.py", line 201, in request
[Mon Sep 30 01:16:56.209194 2019] [:error] [pid 2778] [remote 172.31.0.71:136]     **kwargs
[Mon Sep 30 01:16:56.209197 2019] [:error] [pid 2778] [remote 172.31.0.71:136]   File "/opt/python/run/venv/local/lib/python3.6/site-packages/requests_oauthlib/oauth2_session.py", line 395, in request
[Mon Sep 30 01:16:56.209200 2019] [:error] [pid 2778] [remote 172.31.0.71:136]     http_method=method, body=data, headers=headers)
[Mon Sep 30 01:16:56.209203 2019] [:error] [pid 2778] [remote 172.31.0.71:136]   File "/opt/python/run/venv/local/lib/python3.6/site-packages/oauthlib/oauth2/rfc6749/clients/base.py", line 198, in add_token
[Mon Sep 30 01:16:56.209206 2019] [:error] [pid 2778] [remote 172.31.0.71:136]     raise TokenExpiredError()
[Mon Sep 30 01:16:56.209210 2019] [:error] [pid 2778] [remote 172.31.0.71:136] oauthlib.oauth2.rfc6749.errors.TokenExpiredError: (token_expired) 
[Mon Sep 30 01:16:56.209232 2019] [:error] [pid 2778] [remote 172.31.0.71:136]