HTTP status Code

1XX (ad hoc response): A status code that represents a temporary response and requires the requestor to perform an action to continue.

Status code	Description
100 (Continue)	The requestor shall continue to make the request. The return of this code by the server means that the server has received the first part of the request and is now waiting to receive the remainder.
101 (Switching protocol)	The requestor has asked the server to switch protocols, and the server has confirmed and is ready to switch.

2XX (Success): Used to indicate that the server has successfully processed the request's status code.

Status code	Description
200 (success)	The server has successfully processed the request. Typically, this indicates that the server provided the requested Web page. If your robots.txt file is displayed for this status, this means that Googlebot has successfully retrieved the file.
201 (created)	The request was successful and the server has created a new resource.

HTTP status Code