flask-restx is not compatible with the latest werkzeug

[12rambau]

the 2.2.0 release of pallets/werkzeug breaks flask-restx.

Here you can find the following traceback:

../../.local/lib/python3.8/site-packages/flask_restx/__init__.py:5: in <module>
    from .api import Api  # noqa
../../.local/lib/python3.8/site-packages/flask_restx/api.py:50: in <module>
    from .swagger import Swagger
../../.local/lib/python3.8/site-packages/flask_restx/swagger.py:18: in <module>
    from werkzeug.routing import parse_rule
E   ImportError: cannot import name 'parse_rule' from 'werkzeug.routing' (/home/prambaud/.local/lib/python3.8/site-packages/werkzeug/routing/__init__.py)

Repro Steps (if applicable)

1. install flas-restx
2. import flask-restx.swagger as frs
3. Broken!

[bbnil]

parse_rule() is marked as :internal:, shouldn't be used by flask-restx
https://github.com/pallets/werkzeug/blob/2.1.x/src/werkzeug/routing.py#L215

[marcszy91]

I can confirm the bug

[j4asper]

Can also confirm the bug.
Quick workaround is to downgrade Flask to v2.1.2, since the newest version requires Werkzeug >= 2.2.0 and Flask v2.1.2 just requires Werkzeug>=2.0
To prevent the flask requirement from getting the newest version of Werkzeug, it should be listed first in the requirements.txt file. Hope that solves someones issue.

Werkzeug <= 2.1.2   
flask == 2.1.2   
flask-restx >= 0.5.1  

[peter-doggart]

There is also an issue with flask-restx and werkzeug 2.1.x (#422) so I would maybe recommend setting werkzeug==2.0.* for now.