Web Reference: Sep 1, 2022 · I'm learning web development for simple applications and I've created one that uses before_first_request decorator. According with the new release notes, the before_first_request is deprecated and will be removed from Flask 2.3: Aug 19, 2025 · Changed logic of before first request handlers to flip the flag after invoking. This will allow some uses that are potentially dangerous but should probably be permitted. Nov 23, 2022 · Flask's before_first_request is being deprecated, due to some fairly valid reasoning. I totally get the reasoning behind it, and I even agree with it! However, I have a Flask-based publishing framework that relies on its behavior. In particular, my framework wraps Flask via inheritance.
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