Short Answer
Complete Explanation
The HTTP status code 203 Non‑Authoritative Information indicates that the request was successful but the enclosed payload has been transformed by a proxy or other intermediary and therefore may not be a perfect representation of the original resource.
- Definition:
203 is part of the 2xx class of successful responses defined in RFC 7231. - Typical Use Cases:
Used when a caching proxy modifies the response body (e.g., adding headers, merging content) before forwarding it to the client. - Difference from 200 OK:
200 conveys that the payload is exactly as the origin server intended, whereas 203 warns that the payload may have been altered. - Client Behaviour:
Clients should treat the response as successful but may need to verify the integrity of the data if exactness is critical. - Related Codes:
Other 2xx codes such as 202 Accepted and 204 No Content also indicate successful outcomes with specific nuances.
Common Misconceptions
203 means the request failed.
203 is a success code; it signals successful handling but with possibly altered content.
203 is interchangeable with 200.
While both denote success, 200 guarantees unmodified content, whereas 203 explicitly notes non‑authoritative data.
FAQ
When should a developer return a 203 status code?
A developer should return 203 when the server has successfully processed the request but the response payload has been transformed by an intermediary (e.g., a caching proxy) and therefore may not reflect the original representation from the origin server.
How do browsers handle a 203 response?
Browsers treat 203 as a successful response, rendering the payload as usual. However, because the content is marked non‑authoritative, browsers do not perform special error handling; developers may need to implement additional checks if data integrity is essential.
Is 203 widely supported across HTTP clients?
Yes, 203 is defined in the HTTP/1.1 specification and is recognized by all major browsers, HTTP libraries, and API clients, though its use is relatively rare compared with more common codes like 200 or 404.
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