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203
Success

203 Non-Authoritative Information

The returned metadata is from a local or third-party copy, not from the origin server.

Description

203 Non-Authoritative Information indicates that the request was successful, but the enclosed payload has been modified by a transforming proxy. The information may come from a cached copy, a CDN, or a middleware layer rather than directly from the origin server.

This is rarely used in modern web applications but may appear in proxy or gateway responses.

Common Causes

  • CDN or proxy modifying headers or body
  • Transformation middleware stripping sensitive fields
  • Aggregation services combining data from multiple sources

How to Fix

  • If you need authoritative data, bypass caches and connect directly to origin
  • Document clearly which layers may transform responses
  • Use Vary headers to communicate caching dimensions

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Related Status Codes

200
200 OK
The request has succeeded. The meaning depends on the HTTP method used.
 201
201 Created
The request has been fulfilled and a new resource has been created.
 202
202 Accepted
The request has been accepted for processing, but processing has not been completed.
 204
204 No Content
The server successfully processed the request but returns no content.
 205
205 Reset Content
Request was successful; the client should reset the document view (e.g. clear a form).
 206
206 Partial Content
The server is delivering only part of the resource due to a range header.

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