"Request" object has no attribute "is_xhr"

[wangkai19961223]

It seems "Request" object has no attribute "is_xhr" ，Getting warnings here... How do we fix this?

[greyli]

Duplicate of #3493. The request.is_xhr property was deprecated since Werkzeug 0.13 and removed in Werkzeug 1.0.0. You will get this error when using Flask <= 0.12.4 and Werkzeug >=1.0.0 because Flask uses this property in the source before the 1.0.0 version. You can just upgrade Flask to fix this issue:

$ pip install -U flask

Or with Pipenv:

$ pipenv update flask

Otherwise, you can also downgrade Werkzeug to 0.16.1:

$ pip install werkzeug==0.16.1  # pipenv install werkzeug==0.16.1