HTTP 407 Proxy Authentication Required vs 505 HTTP Version Not Supported
HTTP 407 (Proxy Authentication Required) is a 4xx Client Error response, while 505 (HTTP Version Not Supported) is a 5xx Server Error response. 407 indicates that the client must first authenticate itself with the proxy. In contrast, 505 means that the server does not support the HTTP version used in the request.
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 does not support the HTTP version used in the request.
When You See It
When a client uses an HTTP version the server doesn't support.
How to Fix
Use a supported HTTP version (typically HTTP/1.1 or HTTP/2).
Key Differences
407 is a 4xx Client Error response, while 505 is a 5xx Server Error response.
HTTP 407: The client must first authenticate itself with the proxy.
HTTP 505: The server does not support the HTTP version used in the request.
You encounter 407 when when accessing the internet through a corporate proxy that requires authentication.
You encounter 505 when when a client uses an HTTP version the server doesn't support.
When to Use Which
For 407 (Proxy Authentication Required): Configure proxy credentials in your HTTP client or browser settings. For 505 (HTTP Version Not Supported): Use a supported HTTP version (typically HTTP/1.1 or HTTP/2).