HTTP 203 Non-Authoritative Information vs 503 Service Unavailable
HTTP 203 (Non-Authoritative Information) is a 2xx Success response, while 503 (Service Unavailable) is a 5xx Server Error response. 203 indicates that the response payload has been modified by a transforming proxy from the origin server's 200 response. In contrast, 503 means that the server is temporarily unable to handle the request due to maintenance or overload. Should include a Retry-After header.
Description
The response payload has been modified by a transforming proxy from the origin server's 200 response.
Quand vous le voyez
When a proxy or CDN modifies the response body (e.g., adds headers, transforms content).
Comment résoudre
Check if a proxy is modifying the response. Access the origin directly if you need the original content.
Description
The server is temporarily unable to handle the request due to maintenance or overload. Should include a Retry-After header.
Quand vous le voyez
During maintenance windows, server overload, or when the application pool is exhausted.
Comment résoudre
Wait and retry. Check the Retry-After header. Scale up servers if it's a capacity issue.
Différences clés
203 is a 2xx Success response, while 503 is a 5xx Server Error response.
HTTP 203: The response payload has been modified by a transforming proxy from the origin server's 200 response.
HTTP 503: The server is temporarily unable to handle the request due to maintenance or overload. Should include a Retry-After header.
You encounter 203 when when a proxy or CDN modifies the response body (e.g., adds headers, transforms content).
You encounter 503 when during maintenance windows, server overload, or when the application pool is exhausted.
Quand utiliser lequel
For 203 (Non-Authoritative Information): Check if a proxy is modifying the response. Access the origin directly if you need the original content. For 503 (Service Unavailable): Wait and retry. Check the Retry-After header. Scale up servers if it's a capacity issue.