You probably did not register this filter; you have to register the filter using a statement similar to: jinja_env.filters['variable_name_here'] = identifier.
This discussion group is oriented more towards general opinions, trends, and issues of general nature touching App Engine and Cloud SQL. For coding and programming architecture, as well as setting up Jinja urlize filters, you may be better served in dedicated forums such as stackoverflow, where experienced programmers are within reach and ready to help. You have done the right thing by posting Why is Jinja2 urlize filter not working with GAE flask app? <https://stackoverflow.com/questions/58440114/why-is-jinja2-urlize-filter-not-working-with-gae-flask-app> -- You received this message because you are subscribed to the Google Groups "Google App Engine" group. To unsubscribe from this group and stop receiving emails from it, send an email to google-appengine+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/google-appengine/e27354f0-57de-4e60-af0e-bfffb020da84%40googlegroups.com.