 will return from
 <a href="../../../jakarta/faces/application/Resource.html#getContentType--"><code>Resource.getContentType()</code></a>. If the value is <code>null</code>, The content-type of the resource is derived by
 passing the <em>resourceName</em> to <a href="../../../jakarta/faces/context/ExternalContext.html#getMimeType-java.lang.String-"><code>ExternalContext.getMimeType(java.lang.String)</code></a></dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>a newly created <code>Resource</code> 