A lot of what gets said about Google sounds like it’s coming from the Wizard of Oz. Google likes this. Google penalizes that. If you’ve never seen what’s actually happening under the hood, that vagueness makes it almost impossible to know what to act on. HTTP status codes are one of the few places where the technical layer becomes legible. They’re the short messages your website sends back to anyone (or anything) trying to access a page, and a handful of them have real consequences for SEO.
Main Takeaways
- A 200 means the page loaded normally. No action needed. That’s the goal.
- 301 redirects are permanent and pass most authority to the new URL. 302s are temporary and don’t pass authority right away, but Google may eventually treat them as 301s if they sit long enough.
- 404 (not found) and 500-level (server errors) are problems. A handful aren’t a big deal. Thousands of them signal an unhealthy site that crawlers will visit less often.
- Technical SEO won’t boost your rankings on its own. It removes hurdles so your relevance and authority work has a chance to show up.
The Setup: Why HTTP Status Codes Matter
Imagine you punch a grocery store address into Google Maps and start driving. Plenty of things can happen along the way. The store could be exactly where it’s supposed to be. Or it could have moved. Or it could be temporarily set up next door for renovations. Or it could not exist anymore. Or the parking lot could be blocked off. Or the Maps app itself could just refuse to load.
Each of those scenarios maps to a status code. When a search engine crawler visits your URLs, it’s running the same trip thousands of times across your site, and the experience it has shapes how it treats your content. A clean trip every time means the crawler keeps coming back and trusts what it finds. A broken trip every time means it visits less often and starts discounting what’s there.
Here are the codes worth knowing.
200 OK: The Page Loaded as Expected
A 200 response means the page was found and served normally. Nothing notable happened. In the analogy, you punched in the grocery store address, you followed directions, and you ended up in the parking lot. There were no detours, no signs on the door, no surprises.
A 200 isn’t something to celebrate. It’s the baseline you want every important page on your site to return. Most of your URLs should be returning 200s the vast majority of the time.
301 Permanent Redirect: Moved for Good
A 301 tells the crawler that the URL it tried to reach has permanently moved to a new address. In the analogy, you arrive at the grocery store and there’s a sign on the door: “We’ve moved across town. Here’s the new address.” It’s a little frustrating because now you have to drive somewhere else, but you’ll still end up where you wanted to go.
301s are how content moves around the web without breaking everything. When you change a URL, retire a page, or restructure your site, you set up a 301 from the old address to the new one. Google’s official redirect documentation recommends a permanent server-side 301 (or 308) whenever the move is meant to be permanent. A 301 tells Google to:
- Drop the old URL from the index
- Start indexing the new URL
- Pass most of the accumulated authority (links, ranking signals, history) from the old URL to the new one
You won’t always get 100% of the original authority. Search engines are conservative, and changes to the destination page (different content, different user experience, lost trust) can cost you a portion of what was there. But you’ll get enough to consolidate your investment, which beats the alternative: moving content with no redirect at all and losing everything that page had earned.
If you’re moving houses, the 301 is your USPS forwarding address. Without it, your mail (and your authority) just disappears.
302 Temporary Redirect: Moved for Now
A 302 tells the crawler that the URL is temporarily pointing somewhere else but is expected to come back. In the analogy, you arrive at the store and there’s a sign: “We’re temporarily set up next door while we renovate. We’ll be back at this location soon.” The original spot still exists, the move is short-term, and the crawler treats it accordingly.
A 302 usually doesn’t drop the original URL from the index right away, because Google believes it’s coming back. The original URL keeps its rankings in the short term, and visitors who hit it get sent to the temporary destination.
If a 302 stays in place long enough, Google eventually concludes the page isn’t coming back and starts treating it as a 301. The order matters: 301s are deliberate signals you control, while letting a 302 drift into being treated as a 301 means the consolidation happens on Google’s timeline, not yours.
A quick note on 307 and 308
These are stricter versions of 302 and 301 respectively. A 307 is a temporary redirect (like a 302) that requires the request method to be preserved. A 308 is a permanent redirect (like a 301) with the same method-preservation requirement. For SEO purposes, treat 307 the way you treat 302 and 308 the way you treat 301. The technical distinction matters more for engineers handling form submissions and APIs than for marketers tracking ranking impact.
404 Not Found: Dead End
A 404 means the page doesn’t exist. The crawler (or the visitor) requested a URL, and the server has nothing to return. In the analogy, Google Maps tells you you’ve arrived, you look around, and you’re standing in front of houses. There’s no grocery store. There’s no sign. There’s just nothing there.
That experience erodes trust fast. If Google Maps consistently sent you to addresses that didn’t exist, you’d switch to Apple Maps. Search engines treat sites the same way. A handful of 404s on a large site is normal and not a problem. Thousands of them signal that the site is poorly maintained, and crawlers will visit less often and surface fewer of your pages.
The most common cause of avoidable 404s is killing content without setting up a redirect. If you’re going to remove or move a page that has any history (incoming links, indexed status, traffic), set up a 301 to the closest equivalent. Otherwise, you’ve just thrown away whatever that page had earned.
403 Forbidden: Access Blocked
A 403 means the page exists but the visitor (or crawler) isn’t allowed to access it. It’s a “do not enter” sign. The store is there, the parking lot is open, but the doors are locked because of a private event or restricted hours.
403s aren’t errors in the same way 404s and 500s are. They’re intentional. The problem is when 403s show up unintentionally, usually because of misconfigured permissions, aggressive bot blocking, or security plugins that lock out search engine crawlers along with bad actors. If Googlebot is hitting 403s on pages that should be public, that’s a bug to fix.
500-Level Errors: The Server Broke
A 500-level response means something on the server side failed. The page might be fine in theory, but the server couldn’t deliver it. In the analogy, Google Maps starts loading directions and then just spins forever. It’s not your fault. It’s not the store’s fault. The Maps app itself is broken, so you never find out whether the trip would have worked.
500-level errors usually come from server problems, plugin conflicts, PHP memory limits, corrupted .htaccess files, or sites that crash under load. The classic signal is a blank screen or a generic “something went wrong” page. If pages are frequently returning 500s, crawlers can’t reliably access them, which means they can’t be indexed or ranked at all. Inaccessible content doesn’t compete.
What This All Means for Your SEO
If you’ve read the analogy I wrote on how search engines rank pages, the role of status codes will sound familiar. Technical SEO doesn’t directly boost rankings. It removes hurdles. Status codes are one of the clearest places to see whether the hurdles are there.
The way to think about it: every link a crawler follows on your site is a small trip. If the trips are clean (mostly 200s, with occasional well-implemented 301s), the crawler keeps coming back, indexes more of your content, and treats your site as a reliable source. If the trips are messy (lots of 404s, drifting 302s that should be 301s, sporadic 500s), the crawler visits less often and trusts the site less.
That’s why technical issues matter even when they’re invisible to your visitors. The site can look fine to a human while sending a steady stream of broken signals to crawlers, which quietly caps how much of your content shows up in search and how often. Cleaning up status codes won’t get you ranked. It clears the path so your relevance and authority work can show up in the results.
Status Codes at a Glance
The codes covered above are the ones marketers run into most often. Here’s a fuller cheat sheet, including a few worth knowing even if you only encounter them occasionally. Save this as a reference for the next time you’re reviewing a crawl report, looking at Search Console, or trying to make sense of what your dev team is talking about. For deeper detail on how Google specifically handles each one, Google’s HTTP status codes guide is the source of truth.
| Code | Name | What It Means | What Marketers Should Know |
|---|---|---|---|
| 200 | OK | Page loaded normally. | The baseline. Most of your important URLs should be returning this. |
| 301 | Moved Permanently | The page has moved to a new URL for good. | Passes most authority to the new URL. Use when retiring or restructuring pages. |
| 302 | Found (Temporary Redirect) | The page is temporarily at a different URL. | Doesn’t pass authority right away. If left long enough, Google treats it as a 301. |
| 304 | Not Modified | The page hasn’t changed since the last crawl. | Helps with caching and crawl efficiency. Normal to see in server logs, not a problem. |
| 307 | Temporary Redirect (Strict) | Like a 302 but preserves the request method. | Treat the same as a 302 for SEO purposes. |
| 308 | Permanent Redirect (Strict) | Like a 301 but preserves the request method. | Treat the same as a 301 for SEO purposes. |
| 401 | Unauthorized | Authentication is required to access the page. | Different from 403. Means the visitor needs to log in. Common on member-gated content. |
| 403 | Forbidden | Access is intentionally blocked. | Not an error. A problem only if pages that should be public are blocking crawlers. |
| 404 | Not Found | The page doesn’t exist. | A handful are normal. Thousands signal an unhealthy site. Set up 301s when retiring URLs. |
| 410 | Gone | The page existed but has been permanently removed. | Stronger signal than 404. Tells Google to drop the URL faster. Use for deliberate, permanent removals. |
| 429 | Too Many Requests | The server is rate-limiting the requester. | Can block legitimate crawlers if misconfigured. Check rate-limiting rules if Googlebot is hitting these. |
| 500 | Internal Server Error | Something on the server failed. | Pages can’t be indexed if they’re regularly returning 500s. Investigate plugin conflicts, memory limits, or code errors. |
| 502 | Bad Gateway | A server upstream returned an invalid response. | Often a CDN or proxy issue. Worth investigating with your hosting provider if persistent. |
| 503 | Service Unavailable | The server is temporarily unable to handle the request. | The right code to return during planned maintenance. Tells crawlers to come back later without dropping rankings. |
| 504 | Gateway Timeout | An upstream server didn’t respond in time. | Often a sign of slow database queries or overloaded servers. Hurts both user experience and crawlability. |
