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I think I understand your sentiment, but what's wrong with flask??

i assume the poster means running flask in production without something like nginx in front to serve as the webserver.

the flask build in webserver is not production grade software in my opinion.

It is also the opinion of the people who wrote the built-in webserver. If you try to run it in production mode, it'll emits this warning on startup:

> WARNING: This is a development server. Do not use it in a production deployment. > Use a production WSGI server instead.

I don't expect junior devs to have a sense for what is production-grade and what is not, but if they try to ship software that explicitly warns against being used in production, you've got a real liability on your hands.

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