Google’s John Mueller says it’s normal if 30-40% of URLs in a site’s Search Console report are returning 404 errors.
This is stated during the Google Search Central SEO hangout from February 25, where we also learned it’s impossible to stop Google from trying to crawl URLs that no longer exist.
Google may continue trying to crawl URLs years after they’ve been deleted from a website, and there’s nothing site owners can do to prevent that from happening.
Therefore 404s are…
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