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This fixes an issue where the session cookies are shared between instances when running multiple instances of the app under different URL prefixes. Setting APPLICATION_ROOT (or SESSION_COOKIE_PATH) should limit the session cookies to the configured URL prefix. See https://flask.palletsprojects.com/en/3.0.x/config/#APPLICATION_ROOT . Signed-off-by: Andre Moreira Magalhaes <andre.magalhaes@collabora.com>