201 Created

The request succeeded and created a new resource, usually named in the Location header.

Class
2xx Successful. The request was received, understood and accepted.
Registered
Yes, in the IANA HTTP status code registry.
Cacheable by default
No. A cache stores it only when Cache-Control or Expires says to.
References
RFC 9110 ยง15.3.2 · MDN

Example response

HTTP/1.1 201 Created
Location: /orders/1234

Every 2xx code

All HTTP status codes, in one table