 use for its sessions.
 This list is used to generate the Sec-WebSocket-Protocol header in the opening
 handshake for clients using this configuration. The first protocol name is the most preferred.
 See <a href="http://tools.ietf.org/html/rfc6455#section-4.1">Client Opening Handshake</a>.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the list of the preferred subprotocols, the empty list if there are none</dd>
</dl>
</li>
</ul>
<a name="getExtensions--">
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</a>
<ul class="block