Search engines like google and yahoo don’t index 4XX pages mainly because they don’t get the job done. Because of this, they’ll ignore any canonical tags pointing to these kinds of pages and sometimes turn out indexing the wrong (non-canonical) version of your web site. In the diagram, we display the https://addons.prestashop.com/fr/seo-referencement-naturel/31857-seo-automatique-google-rich-snippets-json-ld-open-graph.html