HTTP 226 IM Used vs 499 Client Closed Request
HTTP 226 (IM Used) is a 2xx Success response, while 499 (Client Closed Request) 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, 499 means that a non-standard status code used by Nginx when the client closes the connection before the server responds.
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
A non-standard status code used by Nginx when the client closes the connection before the server responds.
When You See It
In Nginx logs when clients timeout or navigate away before receiving the response.
How to Fix
Optimize server response times. Check for slow upstream services.
Key Differences
226 is a 2xx Success response, while 499 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 499: A non-standard status code used by Nginx when the client closes the connection before the server responds.
You encounter 226 when when using delta encoding to reduce bandwidth.
You encounter 499 when in Nginx logs when clients timeout or navigate away before receiving the response.
When to Use Which
For 226 (IM Used): Rarely encountered. The response uses Instance Manipulations (IM) as specified. For 499 (Client Closed Request): Optimize server response times. Check for slow upstream services.