/pre>
<div class="block">Returns the version of the websocket protocol currently being used. This is taken
 as the value of the Sec-WebSocket-Version header used in the opening handshake. i.e. "13".</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the protocol version.</dd>
</dl>
</li>
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<h4>getNegotiatedSubprotocol</h4>
<pre><a href="http://docs.oracle.com/javase/8/docs/api/java/lang/Str