field Registered
Verified 2026-09-18 · registry updated
2026-08-28Proxy-Authenticate
Challenges a client to authenticate with a proxy.
A 407 response uses Proxy-Authenticate, while Proxy-Authorization carries the client's credentials on a later request.
httpheaderauthproxy
Reference (http)
Proxy-Authenticate: Basic realm="corp-proxy"
A 407 response uses Proxy-Authenticate, while Proxy-Authorization carries the client's credentials on a later request.
Common mistakes
- Confusing proxy authentication with authentication at the origin server.
IANA registry: http-fields/field-names
Registry reference: RFC 9110, Section 11.7.1: HTTP Semantics