Error 404 Wayback Machine av Didier Lafleur

Checks every 404 pages. If an archive exists in archive.org, a banner is displayed to open this archive.

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Error 404 Wayback Machine detects error codes 404, 408, 410, 451, 500, 502, 503, 504, 509, 520, 521, 523, 524, 525, and 526 and checks to see if archived versions of the URLs requested are available. If they are, a message will be displayed offering the opportunity to view the archived version.
To test this try going to: https://www.whitehouse.gov/the-record/climate

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To test this try going to: https://www.whitehouse.gov/the-record/climate

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