HTTP Status Codes Explained: 200, 301, 404, 500 & More

What Are HTTP Status Codes?

When your browser requests a webpage, the server responds with a three‑digit HTTP status code. These codes tell the browser (and search engines) whether the request succeeded, failed, or something else happened. Understanding them helps you diagnose website problems, improve SEO, and create a better user experience.

Status codes are grouped into five classes:

• 1xx (Informational) – request received, continuing.
• 2xx (Success) – the request was successfully processed.
• 3xx (Redirection) – further action is needed to complete the request.
• 4xx (Client Error) – the request contains bad syntax or cannot be fulfilled by the server.
• 5xx (Server Error) – the server failed to fulfil a valid request.

Most Common HTTP Status Codes (and What They Mean)

200 OK – Success

This is the standard response for successful HTTP requests. It means the page or file was found and delivered properly. You want to see 200 for all your important pages.

301 Moved Permanently – Permanent Redirect

Indicates that a resource has been permanently moved to a new URL. Search engines update their indexes, passing link equity from the old URL to the new one. Always use 301 when changing domain names or moving pages.

SEO impact: Maintains ranking power. Do not use for temporary moves.

302 Found (or 307) – Temporary Redirect

Used for temporary redirects (e.g., A/B testing, maintenance mode). Search engines keep the original URL in their index. Use carefully; permanent moves deserve a 301.

403 Forbidden – Access Denied

The server understands the request but refuses to authorize it. Common causes: incorrect file permissions, IP blocking, or missing index files. Check your `.htaccess` or server configuration.

404 Not Found – Missing Page

The requested resource does not exist. Broken links or deleted pages return 404. Too many 404s can hurt user experience and SEO. Use custom 404 pages to guide visitors back to your site.

👉 Run a site crawl (using tools like Screaming Frog) to find and fix broken links. Also ensure your SSL certificate is valid – a misconfigured HTTPS site can cause 404‑like errors.

410 Gone – Permanently Removed

Similar to 404 but explicitly tells search engines the resource is gone for good. Rarely used, but helpful for content that should be completely delisted.

429 Too Many Requests – Rate Limited

The user has sent too many requests in a given time. Common when APIs are abused or when crawling too aggressively.

500 Internal Server Error – Generic Server Failure

A catch‑all error when the server encounters an unexpected condition. Can be caused by corrupted `.htaccess`, PHP memory limits, or broken plugins. Check your server error logs.

502 Bad Gateway – Proxy/Upstream Error

The server, acting as a proxy, received an invalid response from an upstream server. Often seen with misconfigured Nginx or Cloudflare settings.

503 Service Unavailable – Temporary Overload

The server is unable to handle the request (due to maintenance or traffic spikes). Search engines will try again later. Use a 503 status intentionally during planned maintenance.

504 Gateway Timeout – No Response Upstream

The server did not receive a timely response from another server. Usually a network issue between servers or a slow upstream process.

How HTTP Status Codes Affect SEO

Google and Bing pay close attention to status codes:

• 200 OK – ideal for indexable content.
• 301 / 302 – correctly implemented redirects preserve ranking power.
• 404 / 410 – pages not found waste crawl budget. Remove or redirect broken links.
• 500+ errors – signal an unstable website, harming rankings and crawlability.

Regularly check your site’s status codes via Google Search Console (Coverage report) or a crawling tool.

How to Check HTTP Status Codes for Your Pages

Several free methods:

• Browser developer tools (F12) – Network tab shows status code for each request.
• cURL command line: curl -I https://example.com
• Online HTTP status checkers – enter a URL to see the response.

If you encounter SSL errors (which often produce 403 or 500 codes), use our SSL Checker to verify your certificate validity and grade.

External Resources for HTTP Status Code Reference

For detailed troubleshooting and real‑time monitoring, these external sites offer excellent guides:

• woorldtv.com – video explanations of every status code with server‑specific fixes.
• cartpostal.net – printable HTTP status code cheat sheets and troubleshooting flowcharts.

Frequently Asked Questions (FAQ)

What is the difference between 301 and 302 redirects?

301 is permanent (search engines transfer link equity). 302 is temporary (search engines keep the original URL). Use 301 for domain changes, 302 for short‑term redirects (e.g., seasonal promotions).

Why am I seeing 403 Forbidden on my own site?

Usually incorrect file permissions (set folders to 755, files to 644). Also check that your .htaccess isn’t blocking your IP and that the index file exists.

Can 404 errors hurt my SEO ranking?

Indirectly. A few 404s are normal, but many broken links annoy users and waste crawl budget. Redirect old pages to relevant content.

What should a custom 404 page include?

A helpful message, a search box, links to popular pages, and a clear navigation menu. Avoid redirecting to the homepage – users may leave.

How do I find which pages return 500 errors?

Check Google Search Console (Coverage → Server errors), use a crawler like Screaming Frog, or review your server’s error logs (usually in cPanel or /var/log/).

Master HTTP Status Codes to Keep Your Site Healthy

Knowing these codes helps you communicate with developers, fix issues faster, and improve SEO. Bookmark this guide for quick reference. Next time you see a “500 Internal Server Error”, you’ll know where to start troubleshooting.

Start by checking your SSL certificate – many errors disappear once HTTPS is correctly configured. Use our free SSL Checker to verify your certificate expiry and issuer.