HTTP 203 Non-Authoritative Information vs 303 See Other
HTTP 203 (Non-Authoritative Information) is a 2xx Success response, while 303 (See Other) is a 3xx Redirection response. 203 indicates that the response payload has been modified by a transforming proxy from the origin server's 200 response. In contrast, 303 means that the server is redirecting to a different resource using GET, typically after a POST operation (Post/Redirect/Get pattern).
Descripción
The response payload has been modified by a transforming proxy from the origin server's 200 response.
Cuándo lo verás
When a proxy or CDN modifies the response body (e.g., adds headers, transforms content).
Cómo solucionarlo
Check if a proxy is modifying the response. Access the origin directly if you need the original content.
Descripción
The server is redirecting to a different resource using GET, typically after a POST operation (Post/Redirect/Get pattern).
Cuándo lo verás
After form submissions to prevent resubmission on browser refresh.
Cómo solucionarlo
Follow the Location header with a GET request. This is intentional — part of the PRG pattern.
Diferencias clave
203 is a 2xx Success response, while 303 is a 3xx Redirection response.
HTTP 203: The response payload has been modified by a transforming proxy from the origin server's 200 response.
HTTP 303: The server is redirecting to a different resource using GET, typically after a POST operation (Post/Redirect/Get pattern).
You encounter 203 when when a proxy or CDN modifies the response body (e.g., adds headers, transforms content).
You encounter 303 when after form submissions to prevent resubmission on browser refresh.
Cuándo usar cada uno
For 203 (Non-Authoritative Information): Check if a proxy is modifying the response. Access the origin directly if you need the original content. For 303 (See Other): Follow the Location header with a GET request. This is intentional — part of the PRG pattern.