1XX Informational responses

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About

These are HTTP response status code that provide information, and are called informational response status codes.

They signal that the request was received, continuing process¹.

There are 4 Informational responses ranging between 100 and 199:

100 Continue - An interim response which indicates that the client should continue the request or ignore the response if the request is already finished
101 Switching Protocols - The code is sent in response to an Upgrade request header from the client and indicates the protocol the server is switching to
102 Processing - It was used with WebDAV contexts to indicate that a request has been received by the server, but no status was available at the time of the response
103 Early Hints - Primarily intended to be used with the Link header, letting the user agent start preloading resources while the server prepares a response or preconnect to an origin from which the page will need resources

Wikipedia. “HTTP”. Available at: https://en.wikipedia.org/wiki/HTTP. (Accessed: [2025-05-23 Fri 02:15]). ↩︎
Mozilla Developer Network. “HTTP”. Available at: https://developer.mozilla.org/en-US/docs/Web/HTTP. (Accessed: [2025-05-06 Tue 16:07]). ↩︎