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Proxy-Authenticate

The HTTP Proxy-Authenticate response header defines the authentication method that should be used to gain access to a resource behind a proxy server. It authenticates the request to the proxy server, allowing it to transmit the request further.

The Proxy-Authenticate header is sent along with a 407 Proxy Authentication Required.

Header type	Response header
Forbidden header name	no

Syntax

Proxy-Authenticate: <type> realm=<realm>

Directives

<type>: Authentication type. A common type is "Basic". IANA maintains a list of authentication schemes.
realm=<realm>: A description of the protected area, the realm. If no realm is specified, clients often display a formatted host name instead.

Examples

Proxy-Authenticate: Basic

Proxy-Authenticate: Basic realm="Access to the internal site"

Specifications

Specification	Title
RFC 7235, section 4.3: Proxy-Authenticate	HTTP/1.1: Authentication
RFC 7617	The 'Basic' HTTP Authentication Scheme

Browser compatibilityUpdate compatibility data on GitHub

	Desktop
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari
Basic support	1	?	1	?	Yes	?