226 IM Used

Here's just what changed.

What it properly means

The server fulfilled a GET and the response is the result of one or more instance manipulations (HTTP delta encoding) applied to the current instance.

Class
2xx Successful: here you go
Defined in
RFC 3229

Get one yourself

This endpoint really answers with 226. Point your client at it and see what it does.

curl -i https://httpcodes.dev/api/226