444 response generated from backend?

[Skip Montanaro]

I have a small website, nginx in front of gunicorn which is in front of
flask. Pretty typical stuff. I'm messing around with what I can and can't
do in some situations. I'm intrigued by the non-standard 444 response. Is
it possible to trigger the no-response response from the backend like this
or is it only from within nginx itself?

I followed the directions here:

https://flask.palletsprojects.com/en/2.0.x/errorhandling/

and came up with something which doesn't generate errors in my flask
server, but nginx generates a complete response instead of simply closing
the connection.

This is more out of curiosity than anything else, so if this isn't
possible, no big deal...

Thanks,

Skip Montanaro
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