The number refers to the error code when a browser was able to connect to a given server or resource, but whatever was requested was not found.
404 Day celebrates the unsung heroes customizing the default 404 page with creativity, reminding the importance of maintaining the World Wide Web.
Plenty of administrators customize 404 pages to bring a smile through the tears, including NASA and ESA with space-themed messages.
Tech companies like Oracle and GitHub have fun with their 404 pages, while even the Financial Times displayed creativity in its 404 interpretation.
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