="element-name">getHeaderNames</span>()</div>
<div class="block">Returns an enumeration of all the header names this request contains. If the request has no headers, this method
 returns an empty enumeration.

 <p>
 Some servlet containers do not allow servlets to access headers using this method, in which case this method returns
 <code>null</code></div>
<dl class="notes">
<dt>Returns:</dt>
<dd>an enumeration of all the header names sent with this request; if the request has no headers, an empty
 enumerati