Search engines like yahoo don’t index 4XX pages since they don’t perform. Because of this, they’ll overlook any canonical tags pointing to these pages and often end up indexing the incorrect (non-canonical) Edition from the site. design We'll insert our hook into the header of our template: hook h = ‘MySocialListHeader’ https://bookmark-group.com/story4375899/everything-about-automatic-hreflang-tags-canonical-tags-all-pages-seo