Learn Fix: HTTP 404 Not Found — What It Means & How to Debug

Q: Should I return 404 or redirect to a search page?

It depends on your strategy. A 404 is honest and correct for truly missing pages. Redirecting to a search page with 302 is user-friendly but can confuse search engines. A good compromise is to return 404 with a search form and suggested links embedded in the page.

Q: Is a 404 bad for SEO?

A few 404 errors are normal and won’t hurt your rankings. But many broken links pointing to 404 pages send negative signals. If a page has external links pointing to it, set up a 301 redirect to the nearest relevant page instead of leaving it as a 404. This preserves the link equity.

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HTTP 404 Not Found — What It Means & How to Debug

DodaTech Updated Jun 20, 2025 4 min read

HTTP 404 Not Found indicates the server cannot locate the requested resource — the URL path does not match any existing route, file, or endpoint.

What It Means

The HTTP 404 Not Found status code is the most recognizable error on the web. It tells the client that the server could not find a resource matching the requested URL. This could mean the page was deleted, moved without a redirect, the URL was typed incorrectly, or the link pointing to it was broken.

A 404 response can mean either the resource never existed or it existed and was removed. The server does not distinguish between these cases — it simply reports that it cannot serve anything at that URL. The response body often includes a custom error page, but some API servers return an empty body to avoid revealing information.

When It’s Sent

Typo in the URL — the user types exmple.com instead of example.com
Deleted or moved page — the resource was removed without a redirect
Broken links — another site links to a URL that no longer exists
Missing API endpoint — a client calls /api/v3/users but the API only has /v2
Incorrect route parameter — /users/99999 where no user with that ID exists

Real Example

curl -v https://example.com/nonexistent-page

Expected response:

> GET /nonexistent-page HTTP/1.1
> Host: example.com
>
< HTTP/1.1 404 Not Found
< Content-Type: text/html
< Content-Length: 162
<
<html>
<head><title>404 Not Found</title></head>
<body>
<h1>Page Not Found</h1>
<p>The requested URL was not found on this server.</p>
</body>
</html>

How to Debug

Browser DevTools

Open the Network tab
Reload the page or trigger the navigation
Look for the request with status 404 in red
Click it and check the Request URL — verify the path is correct
Check the Response tab for any error page or message

curl

curl -s -o /dev/null -w "%{http_code}" https://example.com/page

If you get 404, verify the URL path. Use -I to check headers only:

curl -I https://example.com/page

Postman

Enter the URL and send a GET request. The status badge shows 404 Not Found in red. Verify the URL path, method, and base URL against the API documentation.

How to Fix

Check the URL for typos — common mistakes: missing slashes, wrong case, misspelled words
Verify the resource exists — log in to the server or CMS and check if the page/resource is published
Add a redirect — if you moved the resource, set up a 301 redirect from the old URL to the new one
Check the routing table — for web frameworks, verify the route is defined and not shadowed by another route
Review .htaccess or Nginx config — URL rewriting rules might be blocking access
Generate a sitemap — helps identify all live URLs and find gaps

Common Causes

Scenario	What Happens	Why It Matters
Typo in URL	User types the wrong path	Redirect or spell-check the link
Deleted resource	Page removed without redirect	Set up a `301` to the closest related page
Broken external link	Another site links to a non-existent URL	Contact the site owner or add a redirect
Case sensitivity	`/About` vs `/about` mismatch on case-sensitive servers	Standardize URL casing
Missing API version	Client calls `/v3/users` but only `/v2/users` exists	Update the API client to the correct version

FAQ

Should I return 404 or redirect to a search page?

It depends on your strategy. A 404 is honest and correct for truly missing pages. Redirecting to a search page with 302 is user-friendly but can confuse search engines. A good compromise is to return 404 with a search form and suggested links embedded in the page.

How do I find all 404 errors on my site?

Use Google Search Console (Coverage report), your server’s access logs (grep for " 404 "), or a crawling tool like Screaming Frog. Many CDN and analytics platforms also report 404s. Check these regularly to fix broken links before they accumulate.

Is a 404 bad for SEO?

A few 404 errors are normal and won’t hurt your rankings. But many broken links pointing to 404 pages send negative signals. If a page has external links pointing to it, set up a 301 redirect to the nearest relevant page instead of leaving it as a 404. This preserves the link equity.

Related Codes

HTTP 200 OK — the resource exists and loads correctly
HTTP 301 Moved Permanently — how to redirect old URLs properly
HTTP 403 Forbidden — resource exists but is hidden (sometimes servers return 404 instead of 403 for security)
HTTP 500 Internal Server Error — the server failed while trying to serve the resource

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