de> - A String identifying the message layer for the returned ServerAuthConfig object. This argument must not
 be null.</dd>
<dd><code>appContext</code> - A String that identifies the messaging context for the returned ServerAuthConfig object. This
 argument must not be null.</dd>
<dd><code>handler</code> - A CallbackHandler to be passed to the ServerAuthModules encapsulated by ServerAuthContext objects
 derived from the returned ServerAuthConfig. This argument may be null, in which case the implementation 