HTTP Status 226 IM used: A success response code indicates the server has fulfilled a GET request for a resource, and the response is the result of one or multiple manipulations on the current instance.
This status code is often used in conjunction with the HTTP Status 206 partial content responses when dealing with delta encoding in HTTP. When a server responds with 226 IM Used, it means the resource has been modified according to a list of instance manipulations.
What Causes the HTTP Status 226 IM Used?
The HTTP 226 status code typically occurs when a client makes an HTTP partial content request using delta encoding. Delta encoding allows clients to request only the changes (deltas) between the version they already have and the current version on the server.
This is particularly useful for bandwidth optimization and efficient data transfer. When the server processes these delta-encoded requests, it may respond with a 206 HTTP code for partial content, followed by the 226 IM Used status to confirm that instance manipulations were applied successfully to generate the response.
Example
Here’s a practical example of how the HTTP Status Code 206 and 226 IM Used work together:
Request:
GET /document.html HTTP/1.1
Host: example.com
If-None-Match: "123456"
A-IM: vcdiff
Response:
HTTP/1.1 226 IM Used
ETag: "789012"
IM: vcdiff
Date: Thu, 11 Jan 2025 10:00:00 GMT
Content-Type: text/html
Content-Length: 200
[Delta-encoded content showing only changes from version "123456" to "789012"]
In this example, the client requests a document using delta encoding (vcdiff), and the server responds with 226 IM Used, indicating it successfully applied the instance manipulation to generate a delta-encoded response, saving bandwidth by only sending the changes rather than the entire document.
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