HTTP status code

Definition: HTTP status codes are standard response codes that web servers use to communicate the status of a client’s request.

Importance: Essential for debugging, enhancing UX, and SEO.

Structure of HTTP Status Codes 🛠️

• 3-Digit Number: Each code consists of three digits, where the first digit signifies the category.

• Categories: Five classes indicating response types (informational, success, redirection, client error, server error).

1xx - Informational Responses 🔍

• 100 Continue: The server has received the request headers and the client should proceed.

• 101 Switching Protocols: The client requests to switch protocols; the server agrees.

2xx - Success ✅

• 200 OK: Standard response for successful requests.

• 201 Created: New resource successfully created.

• 204 No Content: Success, but no content to return.

3xx - Redirection 🔄

• 301 Moved Permanently: The resource has a new URL; use the new location.

• 302 Found: Resource temporarily moved; use original URL in the future.

• 304 Not Modified: The cached version is still valid; no need to re-download.

4xx - Client Errors 🚫

• 400 Bad Request: Client error in request syntax.

• 401 Unauthorized: Authentication required or failed.

• 403 Forbidden: The Server understands the request but refuses it.

• 404 Not Found: Resource not found on the server.

• 429 Too Many Requests: The client has sent too many requests in a short time.

5xx - Server Errors 🔧

• 500 Internal Server Error: General server error; something went wrong.

• 502 Bad Gateway: The server received an invalid response from an upstream server.

• 503 Service Unavailable: The server is overloaded or under maintenance.

• 504 Gateway Timeout: Upstream server failed to send a timely response.