Dynamically change flask static endpoint for url_for

flask-dynamic-static-endpoint.py

# Flask creates a rule for the static endpoint a initialization
# this means that setting static_url_path and static_folder
# after initilzation do not change the result of url_for('static', filename=...)


# app is in instance of the Flask class

# Your new static path, update the instance just to keep everything consistent
app.static_url_path = "/foo"
# Delete the old rule and substitute your own
# Note this looks like it could change from implementation
# to implementation but I see no other way
del app.url_map._rules_by_endpoint['static']
app.add_url_rule(
    f"{app.static_url_path}/<path:filename>",
    endpoint="static",
    host=None,
    view_func=app.send_static_file,
)