What does HTTP status 226 (Im Used) mean?

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: HTTP 226 is a delta-encoding response used when a representation was transformed from a base instance.

Could be also:
Constant	Type	OS
ERROR_VIRUS_DELETED	Win32 error	Windows
MANUALLY_INITIATED_CRASH	BugCheck Code	Windows

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HTTP_STATUS_FINE	HTTP_STATUS_AMBIGUOUS

HTTP_STATUS_IM_USED

This status belongs to HTTP Delta Encoding. It means the server applied one or more instance manipulations so the response can describe a change relative to a cached representation instead of sending the entire representation again.

Clients must understand the negotiated A-IM and related headers before using the payload. Treating a 226 body as a complete standalone document can produce corrupted content.

A 226 response is tied to instance manipulation and delta encoding: the payload represents the result of applying one or more transformations to a selected instance rather than a conventional full representation. Caches and clients must understand the associated validators and instance-manipulation metadata before reconstructing or storing the result.

RFC 3229: Delta Encoding in HTTP

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