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.
Proxy-Authenticate header is sent along with a
Proxy Authentication Required.
Proxy-Authenticate: <type> realm=<realm>
- Authentication type. A common type is "Basic". IANA maintains a list of authentication schemes.
- A description of the protected area, the realm. If no realm is specified, clients often display a formatted host name instead.
Proxy-Authenticate: Basic realm="Access to the internal site"