In some instances we could want to access the barcode without being connected. For example if we print the report in an scheduled action, the report would be rendered by wkhtmltopdf as public user making the barcode blank (we have a redirection to a html login page instead of the image). A solution requiring view updates in stable version was implemented with: https://github.com/odoo/odoo/commit/14282f165 in 8.0 ( further explained in https://github.com/odoo/odoo/issues/10621 ). This commit fix this another way in 9.0 by making the barcode route public since this doesn't bring any harm, solve this issue and allow the use of the barcode route for public user (which might be wanted). opw-694470