function formatBinary(req, res, body) {
    if (!Buffer.isBuffer(body)) {
        body = new Buffer(body.toString());
    }

    res.setHeader('Content-Length', body.length);

    return body;
}
Binary formatter.

@public
@function formatBinary
@param    {Object} req - the request object
@param    {Object} res - the response object
@param    {Object} body - response body
@returns  {Buffer} body