It's also possible to add the canonical URL in to the HTTP header from the webpage (this aspect is seen only by web browsers) Canonical URLs are used in order to avoid copy information and point out to serps which web site could be the "primary" webpage. That is just https://addons.prestashop.com/pt/seo-referenciamento-natural/31857-rich-snippets-automaticos-json-ld-opengraph-seo.html