It is possible to pressure to incorporate "http" or "https" before the canonical URL (in order to avoid copy in between the http and https Variation of a website). Ex: if you select to pressure https for the canonical URL, the canonical URL from the web page is going to https://addons.prestashop.com/it/seo-indicizzazione-naturale/31857-google-rich-snippet-automatico-json-ld-open-graph-seo.html