HTTP Status Codes for SEOs: 200, 301, 302, 404, 410, and 503 Explained

A publisher assures you that your guest post is live and working. But if their server secretly returns a 302 temporary redirect or 503 service unavailable header, search engines will never credit the link.

Why HTTP Status Codes Dictate Link Equity Flow

Before a search engine reads a single word of content or evaluates an anchor tag, it inspects the HTTP response header returned by the web server.

The status code defines how search engines treat the URL in their index: whether to index the page, follow outbound links, forward link equity, or purge the URL entirely.

Monitoring status codes on both the linking page and your target destination protects backlink integrity. For the foundational vetting framework in this cluster, review the google site search recency: how to check prospect indexing health guide.

200 OK: The Universal Publishing Standard

A 200 OK response indicates that the web server successfully processed the request and served the expected HTML document.

Both the host article and your backlink destination must return clean 200 status codes without intermediate redirect hops.

A clean 200 response ensures immediate indexation and unhindered PageRank transfer.

301 Permanent Redirect vs 302 Temporary Redirect

301 Moved Permanently instructs search engines that the URL has moved definitively. Search algorithms forward link equity and historical metrics to the destination URL.

302 Found signals a temporary move. Search engines keep the original URL indexed and may not forward backlink equity to the destination page.

If a publisher moves your guest post URL, ensure they apply an explicit 301 redirect rather than a temporary 302.

404 Not Found vs 410 Gone

404 Not Found indicates that the requested URL cannot be found on the server. Search engines retry crawling 404 URLs several times before removing them from search results.

410 Gone explicitly tells search engines that the URL was deliberately removed and will never return. Google drops 410 URLs from search results faster than 404s.

If a target backlink page returns a 404 or 410, that backlink is dead and delivers zero search value.

503 Service Unavailable: Server Protection

503 Service Unavailable notifies search engines that the server is temporarily overloaded or undergoing maintenance.

Googlebot backs off and returns later without deindexing the URL or penalizing historical link equity.

However, persistent 503 errors lasting over 7 days cause search engines to deindex pages permanently.

HTTP Status Code SEO Reference Matrix

Frequently Asked Questions