ra path information, this method returns <code>null</code> or the servlet container
 cannot translate the virtual path to a real path for any reason (such as when the web application is executed from an
 archive).

 The web container does not decode this string.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>a <code>String</code> specifying the real path, or <code>null</code> if the URL does not have any extra path
 information</dd>
</dl>
</li>
</ul>
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