POST', for the request. 
                  <div class="features">read-only</div>
</dd>
        <dt id="persistentConnection" class="property">
          <span class="name"><a href="../dart-io/HttpRequest/persistentConnection.html">persistentConnection</a></span>
          <span class="signature">&#8594; <a href="../dart-core/bool-class.html">bool</a></span>         
        </dt>
        <dd>
          The persistent connection state signaled by the client. 
                  <div class="features">read-only