You can grab all network errors by consuming the error event from the network manager. You can also use this https://www.codenameone.com/blog/rest-api-error-handling.html
-- You received this message because you are subscribed to the Google Groups "CodenameOne Discussions" group. To unsubscribe from this group and stop receiving emails from it, send an email to codenameone-discussions+unsubscr...@googlegroups.com. Visit this group at https://groups.google.com/group/codenameone-discussions. To view this discussion on the web visit https://groups.google.com/d/msgid/codenameone-discussions/492119f7-a5b4-40b9-9dda-2fa8ed3eb1b0%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.