public String getClientVerifiedHeader() throws GuacamoleException {
        return environment.getProperty(SSL_AUTH_CLIENT_VERIFIED_HEADER, DEFAULT_CLIENT_VERIFIED_HEADER);
    }
Returns the name of the header to use to retrieve the verification
status of the certificate an HTTP request received from an SSL
termination service providing SSL/TLS client authentication.

@return
    The name of the header to use to retrieve the verification
    status of the certificate an HTTP request received from an SSL
    termination service providing SSL/TLS client authentication.

@throws GuacamoleException
    If the property for configuring the client verification header
    cannot be parsed.
extensions/guacamole-auth-sso/modules/guacamole-auth-sso-ssl/src/main/java/org/apache/guacamole/auth/ssl/conf/ConfigurationService.java