pulate the Sec-WebSocket-Extensions header in the opening handshake for clients
 using this configuration. The first extension in the list is the most preferred extension.
 See <a href="http://tools.ietf.org/html/rfc6455#section-9.1">Negotiating Extensions</a>.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the list of extensions, the empty list if there are none.</dd>
</dl>
</li>
</ul>
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<h4>getC