Use this technique when you need to remove existing replicate pages. All redirection techniques —301 and 302 redirects, meta-refresh, JavaScript redirects—have the same effect on Google Lookup, having said that time it's going to take for engines like google to notice the different redirect procedures might differ. For that fastest https://addons.prestashop.com/es/seo-posicionamiento-buscadores/30904-etiquetas-automaticas-hreflang-canonical-etiquetas-seo.html