HTTP 407 Proxy Authentication Required vs 506 Variant Also Negotiates
HTTP 407 (Proxy Authentication Required) is a 4xx Client Error response, while 506 (Variant Also Negotiates) is a 5xx Server Error response. 407 indicates that the client must first authenticate itself with the proxy. In contrast, 506 means that the server has an internal configuration error: the chosen variant resource is configured to engage in content negotiation itself.
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
The server has an internal configuration error: the chosen variant resource is configured to engage in content negotiation itself.
When You See It
Rare. Indicates a misconfigured server-side content negotiation loop.
How to Fix
Fix the server's content negotiation configuration.
Key Differences
407 is a 4xx Client Error response, while 506 is a 5xx Server Error response.
HTTP 407: The client must first authenticate itself with the proxy.
HTTP 506: The server has an internal configuration error: the chosen variant resource is configured to engage in content negotiation itself.
You encounter 407 when when accessing the internet through a corporate proxy that requires authentication.
You encounter 506 when rare. Indicates a misconfigured server-side content negotiation loop.
When to Use Which
For 407 (Proxy Authentication Required): Configure proxy credentials in your HTTP client or browser settings. For 506 (Variant Also Negotiates): Fix the server's content negotiation configuration.