f this request has not been put into asynchronous mode, i.e., if neither
 <a href="#startAsync()"><code>startAsync()</code></a> nor <a href="#startAsync(jakarta.servlet.ServletRequest,jakarta.servlet.ServletResponse)"><code>startAsync(ServletRequest,ServletResponse)</code></a> has been called</dd>
<dt><span class="simpleTagLabel">Since:</span></dt>
<dd>Servlet 3.0</dd>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="ServletRequest.html#getAsyncContext()"><code>ServletRequest.getAsyncContext()<