Engines like google don’t index 4XX pages as they don’t get the job done. Subsequently, they’ll ignore any canonical tags pointing to this kind of pages and infrequently end up indexing the incorrect (non-canonical) version from the page. While in the diagram, we clearly show the movement of sent events using https://bookmarksystem.com/story18651069/the-5-second-trick-for-prestashop-canonical-url