404 Not Found

What it means

The URL does not map to anything on the server. It may never have existed, or it was removed without a redirect.

Common causes

• A mistyped or outdated URL.
• A deleted page without a redirect.
• A broken internal or external link.

How to fix it

1. Redirect removed pages to the most relevant replacement with a 301.
2. Fix broken internal links.
3. Serve a helpful 404 page with search and links.

Example response

HTTP/1.1 404 Not Found
Content-Type: text/plain; charset=utf-8

Worked example

A user follows a link to /old-guide after that page was removed and receives 404. Restore the page or redirect the old URL to its closest replacement; update internal links so visitors do not keep reaching the missing path.

How to read this response

1. Find the status line in your browser's Network panel, API client, or server access log.
2. Read the response body and headers shown above; headers such as Location, Allow, Retry-After, and WWW-Authenticate explain the next step.
3. Use the code's class to orient your diagnosis: informational, successful, redirected, request-related, or server-side.

SEO impact

404s are normal for pages that truly no longer exist. Redirect URLs that have backlinks or traffic to preserve their value.

How to check a status code

Enter a URL in the HTTP Status Checker to see its status code, every redirect hop, and response time. For redirect-heavy pages, the Website Speed Test shows how much time redirects add.

Frequently asked questions

What it means: HTTP 404

404 Not Found: The server cannot find the requested resource.

Common causes: 404

A mistyped or outdated URL. A deleted page without a redirect. A broken internal or external link.

How to fix it: HTTP 404

Redirect removed pages to the most relevant replacement with a 301. Fix broken internal links. Serve a helpful 404 page with search and links.

Tools