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Which statement is correct about Proxy-Authenticate header

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

A. It is sent by the proxy every time when a HTTP 407 status code is sent
B. It is used by a browser to pass credentials to a proxy
C. It is used by both client and proxy to negotiate the method of credential exchange