HTTP 226 IM Used indicates that the server has fulfilled a GET request for the resource, and the response is a representation of the result of one or more instance-manipulations applied to the current instance. Defined in RFC 3229, this status enables delta encoding — instead of sending the full resource every time, the server sends only what changed since the client's last version. This is a bandwidth optimization for resources that change incrementally, like large feeds or data files.
Response includes the status code, standard headers (including Content-Type), and a small diagnostic JSON body describing the request and returned status.
Simulator URL (copy in the app after load — not a normal link):
https://httpstatus.com/api/status/226
Example request:
curl -i "https://httpstatus.com/api/status/226"