y
 specified as described in <a href="#getCharacterEncoding()"><code>getCharacterEncoding()</code></a> or <a href="#getWriter()"><code>getWriter()</code></a> has been called, the charset parameter
 is included in the string returned. If no character encoding has been specified, the charset parameter is omitted.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>a <code>String</code> specifying the content type, for example, <code>text/html; charset=UTF-8</code>, or
 null</dd>
<dt><span class=