HTTP Canonical Headers: When HTML Tags Are Not Enough
PDFs, images, and API responses have no HTML head to hold a canonical tag — Google's Link response header fills that gap, and most sites never configure it.
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#duplicate content
2 published storiesCanonical archive
Stories tagged Duplicate content
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Canonical Tags for AI Search: Why "Hint, Not Rule" Means Something Different to LLMs
Canonical tags tell Google which duplicate wins. AI crawlers don't confirm they even read the tag — here's what actually shapes citations.
