HTTP 407 Proxy Authentication Required vs 510 Not Extended
HTTP 407 (Proxy Authentication Required) is a 4xx Client Error response, while 510 (Not Extended) is a 5xx Server Error response. 407 indicates that the client must first authenticate itself with the proxy. In contrast, 510 means that further extensions to the request are required for the server to fulfill it.
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.
Description
Further extensions to the request are required for the server to fulfill it.
When You See It
When an HTTP extension required by the server is not present in the request.
How to Fix
Add the required extension headers to your request.
Key Differences
407 is a 4xx Client Error response, while 510 is a 5xx Server Error response.
HTTP 407: The client must first authenticate itself with the proxy.
HTTP 510: Further extensions to the request are required for the server to fulfill it.
You encounter 407 when when accessing the internet through a corporate proxy that requires authentication.
You encounter 510 when when an HTTP extension required by the server is not present in the request.
When to Use Which
For 407 (Proxy Authentication Required): Configure proxy credentials in your HTTP client or browser settings. For 510 (Not Extended): Add the required extension headers to your request.