dy()</pre>
<div class="block">Returns true if data can be written without blocking else returns false.
 <p>
 If this method returns false and a <a href="WriteListener.html" title="interface in jakarta.servlet"><code>WriteListener</code></a> has been set with <a href="#setWriteListener(jakarta.servlet.WriteListener)"><code>setWriteListener(WriteListener)</code></a>,
 then container will subsequently invoke <a href="WriteListener.html#onWritePossible()"><code>WriteListener.onWritePossible()</code></a> once a 