4xx Client Error

HTTP 404 Not Found

The server cannot find the requested resource. This is the most well-known HTTP error. The URL may be mistyped, the resource may have been deleted, or it may have never existed.

Common Causes

Mistyped URL or broken link
Resource has been deleted or moved without a redirect
API endpoint does not exist or has been deprecated
Case-sensitive URL mismatch on the server

How to Fix

1Double-check the URL for typos
2Use the site's search or sitemap to find the correct page
3Set up 301 redirects for moved or renamed resources
4Return a helpful 404 page with navigation links

Example

HTTP 404 Not Found

GET /blog/nonexistent-post HTTP/1.1

→ 404 Not Found
→ The page you're looking for doesn't exist.