Important SEO tip in Odoo!
Odoo adds a canonical URL to its pages and that is really good SEO practice! But beware that when you redirect all http:// requests to https:// and non www urls to www urls or the other way around, you set the website domain of your website to this version as well including the http(s):// part. If not your page is wel redirected but it's canonical refers to another page which makes the page non-indexable!