1xx: Informational
These codes indicate a provisional response and require the requestor to continue.
2xx: Success
Indicates that the client's request was successfully received, understood, and accepted.
3xx: Redirection
Indicates that further action is needed to complete the request.
4xx: Client Error
These codes are sent when the client made an error.
5xx: Server Error
These codes indicate that the server failed to fulfill a valid request.