SSLCACertificateFile
SSLCACertificateFile filename Server config, virtual host Apache v2 only
This directive sets the all-in-one file where you can assemble the
certificates CAs with whose clients you deal. These are used for
Client Authentication. Such a file is simply the concatenation of the
various PEM-encoded certificate files, in order of preference. This
can be used instead of, or as well as,
SSLCACertificatePath
.