all to <a href="../../javax/servlet/ServletRequest.html#startAsync--"><code>ServletRequest.startAsync()</code></a> or
 <a href="../../javax/servlet/ServletRequest.html#startAsync-javax.servlet.ServletRequest-javax.servlet.ServletResponse-"><code>ServletRequest.startAsync(ServletRequest, ServletResponse)</code></a>, and before a call to one of the
 <tt>dispatch</tt> methods of this class. If this method is called before the container-initiated dispatch that
 called <tt>startAsync</tt> has returned to the con