407 Proxy Authentication Required
4xx Client Error
RFC 9110
The proxy in the middle needs you to log in first.
What 407 Proxy Authentication Required means {#what}
Same concept as 401, but the authentication challenge comes from a proxy server, not the origin. The response includes a Proxy-Authenticate header.
When you’ll see a 407 {#when}
- Corporate networks with authenticated proxies
- Intercepting proxies requiring credentials