Response HeaderProxy-Authenticate
Original Beschreibung (engl.):
The Proxy-Authenticate response-header field MUST be included as part
of a 407 (Proxy Authentication Required) response. The field value
consists of a challenge that indicates the authentication scheme and
parameters applicable to the proxy for this Request-URI.
Proxy-Authenticate = "Proxy-Authenticate" ":" 1#challenge
The HTTP access authentication process is described in "HTTP
Authentication: Basic and Digest Access Authentication" [43]. Unlike
WWW-Authenticate, the Proxy-Authenticate header field applies only to
the current connection and SHOULD NOT be passed on to downstream
clients. However, an intermediate proxy might need to obtain its own
credentials by requesting them from the downstream client, which in
some circumstances will appear as if the proxy is forwarding the
Proxy-Authenticate header field.
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