[HTTP] HTTP response status codes > Web/PHP/API

 HTTP response status codes 

https://developer.mozilla.org/en-US/docs/Web/HTTP/Status#server_error_responses 

HTTP response status codes indicate whether a specific HTTP request has been successfully completed.

Responses are grouped in five classes:

- Informational responses (100 – 199)

- Successful responses (200 – 299)

- Redirection messages (300 – 399)

- Client error responses (400 – 499)

- Server error responses (500 – 599)

The status codes listed below are defined by RFC 9110.

HTTP Headers In PHP - Request & Response Headers - Full PHP 8 Tutorial 

https://youtu.be/W7tj0Qlk3rE