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📅 2026-06-18 | 📂 jQuery UI
```html Page Not Found | Rookie Tutorial

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404 NOT FOUND!

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The 404 page is an essential part of any website, carrying the heavy responsibility of user experience and SEO optimization. A 404 error usually occurs when a user visits a page that doesn't exist or has been deleted on the site. If the webmaster hasn't set up a 404 page, dead links will appear, which can negatively impact search engine indexing when crawlers access such URLs.

Origin of 404 Not Found

Legend has it that before the Third Industrial Revolution, the form of the Internet was one large central database located in Room 404. At that time, all requests were manually processed by humans. If the requested file wasn't found in the database, or if the requester had written the wrong file number, users would receive a return message: room 404 : file not found. After the rise of the Internet, people became accustomed to using 404 as the server's error code for files not found. Of course, historical verification shows that the legendary Room 404 never actually existed.

Two Major Benefits of Setting Up a 404 Page

  • Guide users not to close the website, enhancing user experience.
  • Prevent the appearance of dead links on the website.

See more Introduction to HTTP Status Codes.

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