HTTP 226 IM Used vs 406 Not Acceptable
HTTP 226 (IM Used) is a 2xx Success response, while 406 (Not Acceptable) is a 4xx Client Error response. 226 indicates that 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. In contrast, 406 means that the server cannot produce a response matching the Accept headers sent by the client.
Description
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.
When You See It
When using delta encoding to reduce bandwidth.
How to Fix
Rarely encountered. The response uses Instance Manipulations (IM) as specified.
Description
The server cannot produce a response matching the Accept headers sent by the client.
When You See It
When requesting a content type the server doesn't support (e.g., Accept: application/xml when only JSON is available).
How to Fix
Adjust the Accept header to a format the server supports.
Key Differences
226 is a 2xx Success response, while 406 is a 4xx Client Error response.
HTTP 226: 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.
HTTP 406: The server cannot produce a response matching the Accept headers sent by the client.
You encounter 226 when when using delta encoding to reduce bandwidth.
You encounter 406 when when requesting a content type the server doesn't support (e.g., Accept: application/xml when only JSON is available).
When to Use Which
For 226 (IM Used): Rarely encountered. The response uses Instance Manipulations (IM) as specified. For 406 (Not Acceptable): Adjust the Accept header to a format the server supports.