HTTP 407 Proxy Authentication Required vs 425 Too Early
Both HTTP 407 (Proxy Authentication Required) and 425 (Too Early) belong to the 4xx Client Error category. 407 indicates that the client must first authenticate itself with the proxy. Meanwhile, 425 means that the server is unwilling to risk processing a request that might be replayed. Used with TLS 1.3 early data (0-RTT).
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 is unwilling to risk processing a request that might be replayed. Used with TLS 1.3 early data (0-RTT).
When You See It
When a server rejects a request sent as TLS 1.3 early data due to replay risk.
How to Fix
Retry the request after the TLS handshake completes.
Key Differences
HTTP 407: The client must first authenticate itself with the proxy.
HTTP 425: The server is unwilling to risk processing a request that might be replayed. Used with TLS 1.3 early data (0-RTT).
You encounter 407 when when accessing the internet through a corporate proxy that requires authentication.
You encounter 425 when when a server rejects a request sent as TLS 1.3 early data due to replay risk.
When to Use Which
For 407 (Proxy Authentication Required): Configure proxy credentials in your HTTP client or browser settings. For 425 (Too Early): Retry the request after the TLS handshake completes.