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A common occurrence that causes this notice is the ‘?filters=’ attribute.
Read more here.
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A canonical URL is the URL of a page that Google chose as the most representative from a set of duplicate pages |
Duplicate without user-selected canonical
This is not an error and is working as intended, Google does not index duplicate pages and therefore automatically assigning this page as a canonical.
Read more here.
Not Found (404)
This error is returned when Google encounters a deleted/deactivated page.
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