HTTP 203 Non-Authoritative Information vs 407 Proxy Authentication Required
HTTP 203 (Non-Authoritative Information) is a 2xx Success response, while 407 (Proxy Authentication Required) is a 4xx Client Error response. 203 indicates that the response payload has been modified by a transforming proxy from the origin server's 200 response. In contrast, 407 means that the client must first authenticate itself with the proxy.
Description
The response payload has been modified by a transforming proxy from the origin server's 200 response.
When You See It
When a proxy or CDN modifies the response body (e.g., adds headers, transforms content).
How to Fix
Check if a proxy is modifying the response. Access the origin directly if you need the original content.
Description
The client must first authenticate itself with the proxy.
When You See It
When accessing the internet through a corporate proxy that requires authentication.
How to Fix
Configure proxy credentials in your HTTP client or browser settings.
Key Differences
203 is a 2xx Success response, while 407 is a 4xx Client Error response.
HTTP 203: The response payload has been modified by a transforming proxy from the origin server's 200 response.
HTTP 407: The client must first authenticate itself with the proxy.
You encounter 203 when when a proxy or CDN modifies the response body (e.g., adds headers, transforms content).
You encounter 407 when when accessing the internet through a corporate proxy that requires authentication.
When to Use Which
For 203 (Non-Authoritative Information): Check if a proxy is modifying the response. Access the origin directly if you need the original content. For 407 (Proxy Authentication Required): Configure proxy credentials in your HTTP client or browser settings.