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custom 404 page flask

from flask import render_template

@app.errorhandler(404)
def page_not_found(e): # e must be in there
    # note that we set the 404 status, this is what it catches
    return render_template('404.html'), 404

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flask return 404

I had the same issue. I had it because I changed the parameters SERVER_NAMEof the config to a name which is not the name of the server.

You can solve this bug by removing SERVER_NAME from the config if you have it.

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custom 404 page flask

flask return 404

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