How to run code after Flask send_file() or send_from_directory()

Question

I have a Flask-based website where users can download some PDF files.

This is straightforward to implement using Flask\'s send_file() and send_from_directory().

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Answer 1

You can't. While send_file streams the file using Flask when using the dev server, it may (and really should for performance) use the web server (nginx, apache, etc.) and X-SendFile in production. Since the web server is beyond the control of the application, you're out of luck.