HTTP Status Code

3 Digit Response sent by web server

HTTP (Hypertext Transfer Protocol) response that a server sends to the client and help to describe the result of the request, whether it was successful or encountered an error.

HTTP status codes are grouped into five classes, based on the first digit of the code:

1. 1xx (Informational): These codes indicate that the request was received, and the server is continuing to process it.

2. 2xx (Successful): These codes indicate that the request was successfully received, understood, and accepted.

3. 3xx (Redirection): These codes indicate that further action is needed to fulfill the request, usually in the form of following a redirect to a new URL.

4. 4xx (Client Error): These codes indicate that the request contains bad syntax or cannot be fulfilled by the server.

5. 5xx (Server Error): These codes indicate that the server failed to fulfill an apparently valid request.

HTTP Status Codes: A Complete List + ExplanationsSemrush Blog

ref: https://www.semrush.com