uest</a>&nbsp;req)</pre>
<div class="block">Returns the time the <code>HttpServletRequest</code> object was last modified, in milliseconds since midnight January
 1, 1970 GMT. If the time is unknown, this method returns a negative number (the default).

 <p>
 Servlets that support HTTP GET requests and can quickly determine their last modification time should override this
 method. This makes browser and proxy caches work more effectively, reducing the load on server and network resources.</div>
<dl>
<dt><s