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 authenticate 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 |