ase/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a>&gt;&nbsp;getCacheExtension()</pre>
<div class="block">Corresponds to a set of extension cache control directives.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>a mutable map of cache control extension names and their values. If a key has a null value, it will appear as
 a bare directive. If a key has a value that contains no whitespace then the directive will appear as a si