CAS is not supported by the client. Minimum client version is 6.0

[jjaychen1e]

usage: gp-saml-gui [-h] [--no-verify] [-C COOKIES | -K] [-i] [-g | -p]
                   [-c CERT] [--key KEY] [-v | -q] [-x | -P | -S | -E] [-u]
                   [--clientos {Windows,Linux,Mac}] [-f EXTRA]
                   [--allow-insecure-crypto] [--user-agent USER_AGENT]
                   [--no-proxy] [-w]
                   server [openconnect_extra ...]
gp-saml-gui: error: Error in portal prelogin response: CAS is not supported by the client. Minimum client version is 6.0

related issue:

yuezk/GlobalProtect-openconnect#339