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by seodisparate
2216 days ago
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It looks like they want websites to do the following: whenever your website goes under a drastic change, serve the previous version of the website under a subdomain, and redirect all 404s on the newer version to the subdomain. More drastic changes in the future may potentially redirect 404s to previous subdomains/versions like a chain. At least that's my understanding of it. |
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