226IM Used
The server applied a transformation you asked for and is returning the result of it rather than the resource itself.
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Part of the delta-encoding extension, which lets a server send only what changed since a version the client already has. It saw very little adoption, so 226 is one of the rarest codes in the registry.
The problem it solved turned out to be better handled by ordinary caching and compression, which need no negotiation and are supported everywhere. Between 304 for unchanged resources and compression for changed ones, there was little left for delta encoding to do.
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Status codes
69 of 69 codes. Click a row to copy it.
1xx Informational (4)
2xx Success (10)
3xx Redirection (8)
4xx Client errors (31)
5xx Server errors (16)