HTTP status codes are three-digit numbers returned by a web server in response to a browser or client request. They indicate whether a request was successful, redirected, or resulted in an error. Status codes are grouped into five categories: 1xx (informational), 2xx (success), 3xx (redirection), 4xx (client error), and 5xx (server error). utilAZ provides a complete reference for all standard HTTP status codes with explanations and troubleshooting tips.

To fix 404 errors, first verify that the URL is spelled correctly and matches the actual file path on the server. Check if the page was moved or deleted, and set up a 301 redirect to the new location if applicable. Review your server configuration files and .htaccess rules for rewrite errors. You can use utilAZ to look up the 404 status code details and recommended solutions.

The 200 OK status code means the server successfully processed the request and returned the expected content to the client. It is the standard response for a successful GET, POST, or other HTTP request. This is the most common status code on the web and indicates that everything is working as intended.

A 301 redirect indicates that a resource has permanently moved to a new URL, and search engines will transfer link equity to the new address. A 302 redirect signals a temporary move, meaning search engines keep the original URL indexed and do not pass full ranking power. Use 301 for permanent URL changes and 302 when you plan to restore the original URL later.

Start by checking your server error logs for specific error messages that reveal the root cause. Verify file permissions are set correctly (644 for files, 755 for directories) and review recent changes to configuration files or deployed code. Test with a minimal setup to isolate the issue, and ensure your server has enough memory and CPU resources. If the problem persists, contact your hosting provider for server-level diagnostics.