function createServerUpgradeResponse(req, socket, head) {
    return new ServerUpgradeResponse(socket, head);
}
Create a new upgraded response.

@public
@function createServerUpgradeResponse
@param    {Object} req -    the request object
@param    {Object} socket - the network socket
@param    {Object} head -   a buffer, the first packet of the upgraded stream
@returns  {Object}        an upgraded reponses