Client certificate authentication and HTTP

Hi all !

Does anybody know if it´s possible to authenticate with client certificate with HTTP protocol ? In internet Site document I can activate CLient certificate only in SSL conections and not in http. Maybe it´s a silly question but I would like to know your opinións.

Thanks in advance

Subject: Client certs are based on the SSL protocol

Client certificate authentication requires that the server use a certificate, too. To use a server certificate, the server must be running SSL. (And to run SSL, the server must have a certificate, because the cert itself is part of the SSL protocol.)