YouTip

## 404 NOT FOUND! Sorry, the article you requested was not found!! The 404 page is an essential page for any website, carrying 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, which is unfavorable for search engine indexing when spiders crawl such URLs. ## Origin of 404 Not Found It is said that before the third technological revolution, the Internet existed as a large central database, which was located in Room 404. At that time, all requests were completed manually. If the requested file was not found in the database, or if the requester entered the wrong file number, the user would receive a return message: room 404 : f