e CallbackHandler instance must be initialized with any 
          application context needed to process the required callbacks 
          on behalf of the corresponding application.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>A ServerAuthConfig Object that describes the configuration
                of ServerAuthModules at a given message layer,
                and for a particular application context. 
          This method does not return null.</dd>
<dt><span class="throwsLabel">Throws:</