Скачать или смотреть How do I markup a flash message in Flask?

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I was running a Flask application using Python 3.9.13, Flask 1.1.2, Jinja2 2.11.3, and MarkupSafe 1.1.1, using a Redis (3.5.3) as my session store. When I created a flash message with
flash(Markup(' b This /b is a b WARNING /b .'),category="warning")
flash(Markup(' b This /b is a b WARNING /b .'),category="warning")
Flask would display (as expected)
This is a WARNING.
This
WARNING
with the selected backbrouund color associated with the warning flash messages.
warning
I'm trying to move the application to Python 3.12.4, Flask 3.0.3, and MarkupSafe 2.1.5 (Jinja2 ia at 3.1.4, but Flask moved to use MarkupSafe directly, instead of importing it from Jinja2, so I don't think that's relevant, Redis is 5.0.8). However, when I try to redirect to a page with that set as the flash message, the app fails sliently with an Internal Server Error.
Digging deeply into Flask, I can see that it's throwing an exception Encoding objects of type Markup is unsupported, when it's handling the process_response and trying to save the session https://github.com/pallets/flask/blob..., and it seems to be caused by the Markup object in the _flashes list. If convert the Markup to a string, it doesn't fail, but the message is displayed as:
Encoding objects of type Markup is unsupported
https://github.com/pallets/flask/blob... b This /b is a b WARNING /b . (It does display with the correct background color.)
b This /b is a b WARNING /b .
Is there a way to format a flash message in the current Flask like we used to be able to do in earlier versions, or am I doing something wrong?


Tags: python,flask,flash,markupSource of the question:
https://stackoverflow.com/questions/7...

Question and source license information:
https://meta.stackexchange.com/help/l...
https://stackoverflow.com/