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## 404 NOT FOUND! Sorry, the article you are looking for could not be found! A 404 page is an essential page for any website, bearing the responsibility of user experience and SEO optimization. A 404 page typically appears when a user visits a page that does not exist or has been deleted on the website, and the server returns a 404 error. If the webmaster has not set up a 404 page, dead links will occur, and when crawlers visit such URLs, it is not conducive to search engine indexing. ## Origin of 404 Not Found It is said that before the third technological revolution, the internet was in the form of a large central database, which was set up in room 404. At that time, all requests were handled manually. If the required file was not found in the database, or if the requester wrote the wrong file number, the user would receive a return message: room 404 : file not found. Later, when the internet emerged, people just...