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Issue with url_for in flask app

I have a code that after make a DELETE query in mysql it makes a redirect to other endpoint (the same app) but sometime it makes a Bad Gateway Error 502. I don't understand why, it started some weeks ago but I couldn't find the problem. The code that I use to redirect is:

return redirect(url_for('panel_usuario'))

The image that I see in the browser is: enter image description here

It may be a problem of PAW or Cloudfare. Notice that I didn't make a change about DNS, cloudflare or something related to the server.

Are you following https://help.pythonanywhere.com/pages/Cloudflare?