Missing Canonical Tag for a PDF document
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Error: Missing Canonical Tag
But URL is not a webpage it is a PDF document, is this fixable? -
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There's two answers to this.
One is that whilst it's best practice for all URLs to have a canonical (even if it's self-referencing), if this resource has no duplicates, it's not mandatory.
The other is that yes, you can add a canonical tag to a web page. You'd have to do it at the HTTP header level.
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