public String getProxyHostname() {
        return proxyHostname;
    }
Returns the hostname of the guacd instance to use. If the hostname of the
default guacd instance should be used instead, null is returned.

@return
    The hostname of the guacd instance to use, or null if the hostname
    of the default guacd instance should be used.
extensions/guacamole-auth-jdbc/modules/guacamole-auth-jdbc-base/src/main/java/org/apache/guacamole/auth/jdbc/connection/ConnectionModel.java