What is the significance of HTTP status codes starting with 100?

HTTP status codes starting with 100 belong to the informational responses category. They indicate to the client that the request has been received and is being processed.

Main codes in this group:

• 100 Continue — the server has received the initial part of the request and the client can continue sending the rest.
• 101 Switching Protocols — the server agrees to switch to another protocol specified in the headers.

These codes do not contain a response body and are used to manage the data exchange process between the client and the server.