Long: ssl-auto-client-cert Help: Use auto client certificate (Schannel) Added: 7.77.0 See-also: proxy-ssl-auto-client-cert Category: tls Example: --ssl-auto-client-cert $URL --- Tell libcurl to automatically locate and use a client certificate for authentication, when requested by the server. This option is only supported for Schannel (the native Windows SSL library). Prior to 7.77.0 this was the default behavior in libcurl with Schannel. Since the server can request any certificate that supports client authentication in the OS certificate store it could be a privacy violation and unexpected.