 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>
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