http header that request a certificate

Hi,

How can I detect in the http request or response header if the website are requesting a certificate for authentication purposes?

I need this information to generate a special filter rule in our firewall.

Regards
lnriveraAsked:
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ahoffmannCommented:
server will send the
  WWW-Authenticate
header with the value for the realm
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lnriveraAuthor Commented:
I need to know only when the authenticate request need a local certificate to login.
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ahoffmannCommented:
are you talking about SSL/TLS client certificates?
if so, you cannot detect in the response, the client send matching certificaes automatically or ask which one to send
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lnriveraAuthor Commented:
Finally I did it filter the serial number of the certificate in the tcp traffic packets
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lnriveraAuthor Commented:
I don't receive an answer, and finally I solved it by myself
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HTTP Protocol

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