ffect as canceling
 the request processing only once. Invoking a <code>cancel(...)</code> method on an asynchronous response instance that has
 already been cancelled or resumed has no effect and the method call is ignored while returning <code>true</code>, in case
 the request has been cancelled previously. Otherwise, in case the request has been resumed regularly (using a
 <code>resume(...) method</code>) or resumed due to a time-out, method returns <code>false</code>.
 </p></div>
<dl>
<dt><span class="re