404 Not Found

The HTTP 404 Not Found client error response code indicates that the server can't find the requested resource. Links that lead to a 404 page are often called broken or dead links and can be subject to link rot.

A 404 status code does not indicate whether the resource is temporarily or permanently missing. But if a resource is permanently removed, a 410 (Gone) should be used instead of a 404 status.

Status

404 Not Found

Custom error pages

Many web sites customize the look of a 404 page to be more helpful to the user and provide guidance on what to do next. Apache servers can be configured using an .htaccess file and a code snippet like the following example.

ErrorDocument 404 /notfound.html

For an example of a custom 404 page, see MDN's 404 page.

Custom design is a good thing, in moderation. Feel free to make your 404 page humorous and human, but don't confuse your users.

Specifications

Specification
Hypertext Transfer Protocol (HTTP/1.1): Semantics and Content (HTTP/1.1)
# status.404

Browser compatibility

BCD tables only load in the browser

See also