2xx Success

HTTP 226 IM Used

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. Used with delta encoding.

Common Causes

  • Delta encoding applied to reduce bandwidth
  • Instance manipulation via If-Modified-Since with IM header
  • Server applying feed differences for efficient sync

How to Fix

  1. 1No fix needed — delta encoding is working correctly
  2. 2Ensure client can reconstruct the full resource from the delta
  3. 3Verify the IM header specifies a supported manipulation

Example

HTTP 226 IM Used
GET /feed HTTP/1.1
A-IM: feed
If-None-Match: "abc"

→ 226 IM Used
→ Only the changes since version "abc"

Related Success Codes

200

OK

201

Created

202

Accepted

203

Non-Authoritative Information

204

No Content

205

Reset Content

206

Partial Content

207

Multi-Status

208

Already Reported