HTTP status codes are part of the technical foundation of a website. They tell browsers, users, crawlers and other clients what happened when a URL was requested. For SEO, the important question is not whether a site has a certain number of 404s or 301s. It is whether each URL returns the response that matches its intended state and whether important pages remain crawlable, indexable and useful.
This guide explains the HTTP status codes that matter most for SEO, when to use them, common mistakes, and a practical way to troubleshoot them.
What is an HTTP status code?
An HTTP status code is a three-digit response returned by a web server after a client requests a resource. The first digit indicates the broad class of response:
- 1xx: Informational responses
- 2xx: Successful requests
- 3xx: Redirections and other routing responses
- 4xx: Client-side errors
- 5xx: Server-side errors
For SEO work, you will usually spend most of your time investigating 2xx, 3xx, 4xx and 5xx responses.
Why HTTP status codes matter for SEO
Status codes help search engines understand what they should do with a requested URL. A healthy indexable page will normally return a successful response such as 200 OK. A permanently moved page can use a permanent redirect such as 301. A genuinely unavailable page may return 404 Not Found or 410 Gone.
The key SEO principle is accuracy. Do not change a status code simply because you believe one code is more ranking-friendly. Google can process different response types differently, and the correct response depends on what actually happened to the URL.
200 OK: successful page response
200 OK means the server successfully fulfilled the request. This is the normal response you expect for a page that should be accessible to users and potentially eligible for indexing.
A 200 response does not automatically mean that a page will rank or even be indexed. Content quality, canonicalization, internal linking, crawlability, relevance and many other signals still matter.
301 Moved Permanently: permanent redirects
Use a 301 redirect when a URL has permanently moved to a relevant replacement URL. Common examples include changing a URL structure, replacing an outdated article with a better equivalent, or migrating a website.
- Redirect directly to the most relevant final URL.
- Avoid long redirect chains and loops.
- Update internal links so they point directly to the final URL.
- Do not redirect unrelated old URLs to the homepage simply to avoid 404s.
Google states that permanent redirects such as 301 can be used during site moves and that they do not cause PageRank to be lost. Google also recommends avoiding redirect chains and keeping redirects direct where possible.
302 Found: temporary redirects
A 302 generally communicates that the requested resource is temporarily available at another URL. It can be appropriate when the original URL is expected to return or when the redirect is genuinely temporary.
One outdated SEO misconception is that a 302 simply means that no authority is passed. Modern search engines can process redirects based on their context. The practical rule is simpler: use a temporary redirect when the move is temporary and a permanent redirect when the move is permanent.
404 Not Found: the URL does not exist
A 404 tells the client that the requested resource could not be found. A 404 is not automatically an SEO problem.
For example, if a genuinely obsolete URL has no relevant replacement, returning a proper 404 can be the correct solution. The problem is when valuable URLs accidentally return 404 because of broken internal links, migration mistakes, deleted content or incorrect routing.
Do not redirect every 404 to the homepage. If there is a highly relevant replacement, redirect the old URL to that replacement. Otherwise, allowing the URL to return a proper 404 can be appropriate.
410 Gone: content intentionally removed
A 410 indicates that a resource is gone and that the removal is intentional. It can be useful when content has been permanently removed and there is no suitable replacement.
For most SEO workflows, the important decision is not choosing between 404 and 410 for ranking purposes. It is making sure that the response accurately represents the state of the content and that valuable URLs are not accidentally lost.
Soft 404: when the server says 200 but the page is effectively missing
A soft 404 happens when a URL appears to return a successful page response but the content effectively communicates that the page does not exist. This can happen with thin “not found” templates that return 200, empty product pages, or application-generated error pages.
Soft 404s can make technical SEO troubleshooting harder because the server response and the visible content disagree. Check both the HTTP response and what a user actually receives.
Other 3xx responses SEO teams should know
- 303 See Other: commonly used to direct a client to another resource, often after an action that should be followed with a GET request.
- 307 Temporary Redirect: temporary redirect that preserves the request method.
- 308 Permanent Redirect: permanent redirect that preserves the request method.
- 304 Not Modified: tells a client that the cached representation has not changed. It is primarily a caching response rather than an SEO redirect strategy.
4xx errors that can matter in technical SEO
| Status | Meaning | SEO consideration |
|---|---|---|
| 400 | Bad Request | Investigate malformed or invalid requests when they affect important URLs. |
| 401 | Unauthorized | Expected for protected resources, but investigate if public pages accidentally require authentication. |
| 403 | Forbidden | Check whether important resources are being blocked from legitimate crawlers or users. |
| 404 | Not Found | Normal for genuinely missing URLs, but investigate broken internal links and lost valuable pages. |
| 410 | Gone | Useful when content has been intentionally and permanently removed without a replacement. |
| 429 | Too Many Requests | Can indicate rate limiting. Investigate server or CDN rules if legitimate crawlers are affected. |
5xx server errors and SEO risk
5xx responses indicate that the server could not successfully complete an otherwise valid request. Common examples include:
- 500 Internal Server Error
- 502 Bad Gateway
- 503 Service Unavailable
- 504 Gateway Timeout
An isolated server error may not be significant. Repeated or widespread 5xx errors are much more concerning because they can prevent users and search engine crawlers from reliably accessing important content.
When investigating a spike, review server logs, hosting/CDN health, deployment changes, database errors, application timeouts and monitoring data. Do not treat a 5xx issue as simply an SEO metadata problem.
Common HTTP status code mistakes in SEO
1. Redirecting every 404 to the homepage
This can create poor user experiences and irrelevant redirects. Redirect only when there is a genuinely relevant destination.
2. Using 301 for a temporary campaign
If the original URL is expected to return, a temporary redirect may be more appropriate. Choose the response based on the actual lifecycle of the URL.
3. Creating redirect chains
Avoid URL A → URL B → URL C when you can send URL A directly to URL C. Chains add latency and make migrations harder to troubleshoot.
4. Leaving internal links pointing to redirected URLs
When you know the final destination, update important internal links to point directly there. This reduces unnecessary hops and improves the user journey.
5. Treating every 404 as a ranking penalty
404 responses are a normal part of the web. The priority is finding accidental 404s on URLs that should exist or that still have valuable traffic, links or internal references.
6. Ignoring soft 404s
A visually convincing error page can still be technically misleading if it returns a successful response. Check the actual HTTP response when troubleshooting missing pages.
How to audit HTTP status codes for SEO
- Start with important URLs: crawl your key landing pages, articles, category pages and URLs with backlinks.
- Check response codes: identify 3xx chains, 4xx errors and 5xx failures.
- Review redirects: confirm that permanent moves use appropriate permanent redirects and point to relevant final URLs.
- Review internal links: replace important links that unnecessarily point through redirects or to missing URLs.
- Check Search Console: compare crawl and indexing reports with your crawl data.
- Check server and CDN logs: investigate recurring 429 and 5xx responses, especially on important URLs.
- Validate after changes: recrawl the affected URLs and confirm the response, canonical and final destination.
HTTP status codes and SEO ranking: what actually matters?
There is no single HTTP status code that guarantees better rankings. The SEO value comes from correctly communicating the state of a URL and making the site easy for users and search engines to crawl and understand.
A useful way to think about status codes is:
- Page exists and should be accessible: normally 200.
- Page permanently moved to a relevant replacement: normally 301 or 308.
- Page temporarily moved: normally 302 or 307.
- Page genuinely does not exist: normally 404 or, where appropriate, 410.
- Server cannot fulfill the request: investigate 5xx responses quickly when they affect important URLs.
Related SEO resources
For a broader technical review, see our SEO audit checklist. If you are investigating link-related issues after redirects or migrations, our guide to backlinks and SEO provides additional context. You can also use our SEO tools guide to choose tools for crawling, diagnostics and measurement.
Final takeaway
HTTP status codes are not just developer details. They are part of how a website communicates its URL state to users and crawlers. The best SEO approach is not to chase a particular code. It is to make every important URL return an accurate response, use redirects only when they are justified, fix accidental errors, and monitor the technical signals that affect crawling and indexing.
Sources: Google Search Central: Site Moves and Migrations and Google Search documentation updates.
