RevCanonical is url shortening with a twist. Instead of creating its own super short versions of links, it checks to see if the link owner has published a shortened version of the given page using HTML link element. If not, we just return the original URL.
Content tagged “canonical”
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Official Google Webmaster Central Blog: Specify your canonical
Carpe diem on any duplicate content worries: we now support a format that allows you to publicly specify your preferred version of a URL.