Missing
What This Means
Pages that have no canonical URL present either as a link element, or via HTTP header. If a page doesn’t indicate a canonical URL, Google will identify what they think is the best version or URL. This can lead to ranking unpredictability when there are multiple versions discovered, and hence generally all URLs should specify a canonical version.
What Triggers This Issue
This issue is triggered when pages lack a canonical URL, neither specified in a link element nor via an HTTP header.
How To Fix
Specify a canonical URL for every page to avoid any potential ranking unpredictability if multiple versions of the same page are discovered on different URLs.
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