Confirms that the canonical URL target returns a 200 OK status and is indexable.
This check ensures that if a page points to a canonical URL, that target URL actually works, returns a 200 status code, and isn't blocked by robots.txt or noindex tags.
Canonicalizing to a 404, redirect, or blocked page sends mixed signals to search engines and can cause both pages to drop out of the index.
Invalid canonical targets negate the purpose of the canonical tag and waste crawl budget.
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