HTTP Status Codes Every Site Owner Should Recognise

The five families, in plain terms

Think of the first digit as the answer's tone. A 2 means it worked - 200 OK is the healthy default. A 3 means "go elsewhere" - a redirect. A 4 blames the request: the page is gone, forbidden, or the URL is malformed. A 5 blames the server: it crashed, is overloaded, or a dependency failed. Reading that first digit alone already tells you which side of the wire to fix.

For a blogger or site owner you only need to fluently recognise about eight codes, because the rest are rare. The table below maps each to what it means, how Google reads it, and the usual fix.

One trap worth naming: a soft 404 is a URL that returns 200 OK but shows an empty or "not found" page. Google can detect the mismatch and treat it like a 404 while your server insisted it was fine - which is why reading the real code, not assuming, matters.

Why codes matter for SEO

Search engines route crawl effort by status. A clean 200 gets indexed; a 301 tells them the value moved and (permanently) transfers most of the page's link equity; a 404 or 410 gets dropped; and 5xx errors make Google back off, wasting the crawl budget you could spend getting real pages indexed.

Redirect type is the most consequential choice: a 301 says "this is permanent, move the signals," while a 302 says "temporary, keep the original as canonical." Using a 302 for a permanent move leaves both URLs in play; using a 301 for something temporary complicates reverting it.

Checking a URL's real status

Do not eyeball whether a page "looks fine" - open the HTTP status checker, enter the URL, and it fetches through public gateways to report the actual status code, the response time and the content type returned. Because a browser is sandboxed, some servers withhold the code from a cross-origin request; the tool is honest about that and labels when the code was not directly observable rather than inventing one.

Pair it with the broken link checker to find the failing URLs on a page in the first place, then use the status checker to confirm exactly which code each one returns so you apply the right fix. For discovery problems, the index checker reads the same status signal alongside robots and canonical.

Remediation at a glance

The fix always follows the class. Client-side 4xx: repoint, redirect (301) to the correct replacement, or remove the dead reference. Server-side 5xx: it is your host, a plugin, or an upstream - restore health, then re-check. Redirects: collapse chains to a single 301 straight to the final URL, because a 301-to-301-to-201 chain dilutes value and slows crawlers.

After any migration or redesign, batch-check the important URLs, fix every non-200 that should be 200, and give genuine deletions a proper 404 or 410 instead of a misleading soft-200.