HTTP 404 Not Found — Causes and Fixes

HTTP 404 Not Found

The 404 status code is the most recognized HTTP error on the web. It tells the client that the server could not find the requested resource at the given URL, but the server itself is functioning normally.

What Triggers a 404?

• Deleted content — A page or file was removed without a redirect
• Typo in URL — The user or a link mistyped the path
• Renamed routes — An application refactored its URL structure without adding redirects
• Expired links — External sites link to URLs that no longer exist
• Case sensitivity — On Linux servers, /About and /about are different paths

404 vs 410

A 404 means "I cannot find this, and I do not know if it ever existed or will exist." A 410 (Gone) means "This used to exist but was intentionally removed." Search engines treat 410 as a stronger signal to deindex the page.

SEO Impact

Soft 404s (pages that return 200 but display "not found" content) hurt SEO because search engines index the empty page. Always return the correct 404 status code. Implement a custom 404 page with navigation links so users can recover.

Best Practices

1. Set up 301 redirects when moving or renaming pages
2. Return proper 404 status codes, not 200 with error content
3. Create a custom 404 page with search and popular links
4. Monitor 404s in Google Search Console and server logs
5. Use rel="canonical" to avoid duplicate content issues
6. Implement a sitemap and keep it updated