SV: An apache web proxy with client auth?

Ok, have tried to make this work with common sense, but have given up.

Therefore I repeat the question, in hope that it might clarify somewhat:

I have a machine A, which communicates with a machine C via a proxy B
(running apache with mod_ssl). Today, all communication is handled via http.
We must move the communication between B and C to ssl, and C will require
client certificates.

The question now is how can I set up B to send client certificates to C when
it connects
to it?

The directives I have seen mentioned are:

SSLProxyMachineCertificateFile
SSLProxyVerifyDepth
SSLProxyCACertificateFile
SSLProxyCACertificatePath

....but I have not seen any documentation on any of them, does it exist?

regards
Torvald
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