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226 IM Used

The HTTP 226 IM Used status code indicates that the server successfully returned a representation after applying instance manipulations.

Published 16 Jul 2026 · HTTP Status Code

What is HTTP 226 IM Used?

The 226 IM Used response indicates that the server successfully fulfilled a request using instance manipulation.

It is defined by the HTTP Delta Encoding extension and is rarely encountered in modern applications.

What Does IM Mean?

The IM refers to Instance Manipulations, where a server applies transformations to a resource before returning it.

Example

HTTP/1.1 226 IM Used

Common Uses

  • Delta encoding
  • Optimised transfers
  • Bandwidth reduction

Why Does It Matter For DevOps?

While uncommon today, concepts behind 226 are related to performance optimisation, caching, and efficient data transfer.

  • HTTP optimisation
  • Content delivery
  • Network efficiency

Summary

The 226 IM Used response represents a successful response that has been transformed using HTTP instance manipulation.