203 Non-Authoritative Information

The 203 (Non-Authoritative Information) status code indicates that
the request was successful but the enclosed payload has been modified
from that of the origin server’s 200 (OK) response by a transforming
proxy (). This status code allows the
proxy to notify recipients when a transformation has been applied,
since that knowledge might impact later decisions regarding the
content. For example, future cache validation requests for the
content might only be applicable along the same request path (through
the same proxies).

The 203 response is similar to the Warning code of 214 Transformation
Applied (), which has the advantage of being
applicable to responses with any status code.

A 203 response is cacheable by default; i.e., unless otherwise
indicated by the method definition or explicit cache controls (see

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