: Should the canonical link contain a link that will never change, the long version with keywords, or a shortened URL from another domain? I want to prevent SEO from duplicated content. I have

@Becky754

Posted in: #CanonicalUrl #Html #Redirects #Seo

I want to prevent SEO from duplicated content. I have a separate domain only for shortened URLs which is mainly for sharing purpose.

I plan to set the rel=canonical in the HTML head and redirect to the long-version on request, identified through the unique content-id (similar how stackoverflow does).

Which URL should I advisedly point to, getting the highest potential in regard to SEO?
<link rel="canonical" href="https://www.mainpage.com/content/1012921/">
or
<link rel="canonical" href="https://www.mainpage.com/content/1012921/this-is-the-original-and-long-version/">
or
<link rel="canonical" href="https://sho.rt/yd8eEndSX/">

Content-id wont change, but Domain/TLD (even if not assumed to) could.
Shortend Domain/TLD won't never change.

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