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📅 2026-06-18 | 📂 JavaScript
Page Not Found | Online Tutorial

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404 NOT FOUND!

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The 404 page is an essential part of any website, carrying the responsibility of user experience and SEO optimization. A 404 error occurs when a user tries to access 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 encounter such URLs.

Origin of 404 Not Found

Legend has it that before the Third Industrial Revolution, the internet was essentially 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 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 missing files. 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 about HTTP Status Codes Introduction.

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