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Which statement is correct about Proxy-Authorization header?

Posted: Fri Jul 22, 2022 11:28 am
by answerhappygod
Which statement is correct about Proxy-Authorization header?

A. It is a response header used by a proxy to negotiate parameters of the credential exchange and to send challenge to the client
B. It is a request header used to pass client’s credentials to a proxy server
C. It is a response header used by an upstream proxy to ask for credentials from a downstream proxy or user agent