Brave Browser has integrated the Wayback Machine to display web pages that have been removed from a web site or not available due to an issue. When you visit a web page and it returns a ‘404 Not Found’ HTTP error code, the browser will prompt you to check if a saved version is available on the archive.org’s Wayback.org. The browser will also display 14 other error codes that are displayed when a web server is under maintenance or having an issue. These include This, 410, 451, 500, 502, 503, 503 and 504, 504, 509, 520, 521, 523, 524, 525, and 526.
Source: https://www.bleepingcomputer.com/news/software/brave-browser-integrates-wayback-machine-to-view-deleted-web-pages/