Check HTTP Status Code - Website Response Checker

Understanding HTTP Status Codes

Every time a web browser requests a page or file from a server, the server responds with a three-digit code indicating the outcome. These "HTTP status codes" are the language servers used to communicate success, failure, or instructions to the client. Understanding these codes is essential for debugging website issues and optimizing SEO.

Status Code Classes

• 1xx (Informational): Request received, continuing process. Rarely seen by users.
• 2xx (Success): The action was successfully received, understood, and accepted. (e.g., 200 OK)
• 3xx (Redirection): Further action must be taken to complete the request. (e.g., 301 Redirect)
• 4xx (Client Error): The request contains bad syntax or cannot be fulfilled. (e.g., 404 Not Found)
• 5xx (Server Error): The server failed to fulfill an apparently valid request. (e.g., 500 Internal Error)

Critical Status Codes for SEO

Search engines treat different codes differently. A 200 OK tells Google the page is valid and should be indexed. A 301 Moved Permanently tells Google to transfer ranking power to a new URL. A 404 Not Found eventually causes the page to drop from the index. A 503 Service Unavailable tells Google to come back later without de-indexing the page.

Debugging Common Errors

404 Errors: Check for broken links or typos in the URL. If you moved content, set up a 301 redirect.
500 Errors: This is a server-side crash. Check server logs (Apache/Nginx) or PHP error logs to find the culprit (often a syntax error or database connection issue).
502 Bad Gateway: Often caused by an overloaded server or a misconfigured proxy (like Cloudflare).

Using a Header Checker

This tool performs a simple check, but for deep debugging, inspecting the full HTTP headers is valuable. Headers reveal caching policies, server types, and security configurations that accompany the status code.