HTTP Status Code
What is an HTTP Status Code?
An HTTP status code is a three-digit response sent by a web server to a browser or search engine crawler, indicating whether a specific request—such as loading a page—was successful, redirected, or failed. These codes act as the primary communication protocol between your website’s server and the outside world.
How HTTP Status Codes Work
When a user clicks a link or a search engine bot crawls your site, the browser sends an HTTP request to your server. The server responds with a status code.
Success (2xx): The server successfully processed the request.
Redirection (3xx): The page has moved.
Client Errors (4xx): The page cannot be found or the request is faulty.
Server Errors (5xx): The server is unable to fulfill a valid request.
Search engines like Google prioritize sites that return "200 OK" codes, as these signify a stable, healthy environment for crawling and indexing content.
Why HTTP Status Codes Matter for SEO
Status codes directly impact your site's ability to rank. If your server returns 404 (Not Found) or 500 (Internal Server Error) codes, search engines cannot index your content, leading to a loss in visibility. Proper handling of 301 redirects is equally critical to ensure that when you move content or update URLs, you preserve the "link equity" and SEO authority built by your original pages.
Key Categories of HTTP Status Codes
200 OK: The standard response for a successful request.
301 Moved Permanently: Informs bots that the page has moved to a new URL permanently and passes SEO value.
302 Found: A temporary redirect; typically not used for SEO-sensitive page moves.
404 Not Found: The server cannot find the requested resource.
500 Internal Server Error: A generic error indicating the server encountered an unexpected condition.
503 Service Unavailable: The server is temporarily overloaded or down for maintenance.
Example of HTTP Status Codes
Imagine an ecommerce store owner deletes an old seasonal product page but forgets to set up a redirect. A customer—or Googlebot—clicks a link to that product and receives a 404 Not Found error. This wastes "crawl budget" and creates a negative user experience. By implementing a 301 redirect to the current category page, the owner ensures both the user and the search engine reach an active, relevant page.
HTTP Status Codes vs. Other Technical SEO Concepts
Crawl Budget vs. Status Codes: High volumes of 404 or 5xx errors drain your crawl budget, meaning Google spends less time indexing your actual revenue-generating content.
Redirect Chains: When multiple 301/302 redirects occur in sequence, they create "redirect chains," which slow down page speed and can confuse search crawlers.
Common Mistakes With HTTP Status Codes
Soft 404s: Returning a 200 OK status for a page that doesn't exist (e.g., an empty search result page). This confuses search engines.
Ignoring 5xx errors: Failing to monitor server health, causing prolonged periods of downtime that lead to de-indexing.
Overusing 302 Redirects: Using temporary redirects for permanent site migrations, which prevents SEO authority from passing to the new URL.
When Should a Business Focus on HTTP Status Codes?
Every website should monitor these codes, but it is critical during:
Website Migrations: Moving from HTTP to HTTPS or switching domains.
Ecommerce Site Updates: Removing products or changing categories.
Technical Audits: Regularly auditing your site to clean up broken links and server-side errors to maintain performance.
How an SEO Agency Helps With HTTP Status Codes
Managing status codes is a foundational part of technical SEO. At Infinity Marketr, we conduct deep-dive technical audits to identify crawl errors, manage redirect maps during site migrations, and optimize server responses to ensure your site is always accessible to users and search engines. We focus on stabilizing your site’s architecture to support long-term organic growth.
Related Technology Terms
Crawl Budget: The number of pages a search engine bot crawls on your site within a given timeframe.
Server-Side Rendering (SSR): A process where the server generates full HTML for a page, which is then sent to the client.
Robots.txt: A file that instructs search engine crawlers which parts of your site should not be accessed.
Term FAQ
How do I check my website's status codes?
You can use tools like Google Search Console (under the "Crawl stats" report), Screaming Frog SEO Spider, or browser developer tools (Network tab) to view the status codes for your pages.
Does a 404 error hurt my SEO?
A few 404s are normal, but a large number of them indicate broken site architecture. They result in a poor user experience and waste your crawl budget, which can indirectly hurt your rankings.
What is the difference between a 301 and a 302 redirect?
A 301 is a permanent redirect that passes SEO authority (link equity) to the new page. A 302 is a temporary redirect that does not pass the same level of ranking power.
Why is my server returning a 500 error?
A 500-level error indicates an issue with your hosting server’s configuration, such as a script error or database connection failure. You should contact your web host or developer immediately.
What is a "Soft 404"?
A soft 404 occurs when your server returns a "200 OK" status for a page that is effectively missing or empty. Search engines interpret this as a valid page, leading to indexing issues.
Related Glossary
301 Redirect
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302 Redirect
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404 Error
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