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2.2.1.10 X-Accept-Proxy-Authentication

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The X-Accept-Proxy-Authentication header specifies the HTTP authentication schemes that the client supports when challenged by a proxy server. The authentication schemes that are supported by proxy servers, if any, are implementation-specific and MAY be enabled arbitrarily by a server administrator.<48>

An example of how HTTP authentication works is specified in [RFC1945] section 11.

This header is defined for use only in requests sent to a server.

The syntax of the X-Accept-Proxy-Authentication header is defined as follows.

 X-Accept-Proxy-Authentication = "X-Accept-Proxy-Authentication: " 
         auth-scheme *("," auth-scheme) CRLF
 auth-scheme   ; as defined in section 11 of [RFC1945]
 

The following is an example.

 X-Accept-Proxy-Authentication: Negotiate, NTLM, Digest, Basic