The response was produced or transformed by a proxy rather than the origin server.
Quick facts
When does it occur
The response was produced or transformed by a proxy rather than the origin server.
It belongs to the 2xx Successful class of responses, defined in RFC7231#6.3.4.
Browse all codes in this class: 2xx Successful
Frequently asked questions
203 belongs to the 2xx Successful class and is usually cacheable per headers such as Cache-Control (e.g. 200, 301, 304).
2xx Successful: The response was produced or transformed by a proxy rather than the origin server.
Sources & standards
Updated 2026-08-18
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