The Hidden Language of the Web: A Deep Dive into HTTP Status Codes

HTTP status codes are three-digit messages exchanged between browser and server. The page groups them into informational, success, redirection, client error, and server error ranges, and shows how they help with debugging, performance, and SEO.

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• 1xx codes mean the request has been received and is still being processed, with 100 Continue and 101 Switching Protocols as examples.
• 2xx codes mean the request succeeded, including 200 OK, 201 Created, and 204 No Content.
• 3xx codes mean the resource moved and the browser should redirect, with 301 Moved Permanently, 302 Found, and 304 Not Modified.
• 4xx codes point to client-side problems, such as bad syntax, missing authentication, forbidden access, missing resources, invalid methods, and too many requests.
• 5xx codes point to server-side problems, including internal errors, bad gateway responses, service unavailability, and gateway timeouts.
• The page says these codes matter for developers debugging issues, for SEO, and for user troubleshooting when access or loading problems appear.