javascript ssl intermediate cert

try
{

//  if (path.existsSync('sslceerts/intermediate.crt'))
        var sslOptions =
        {
            key: fs.readFileSync('sslcerts/cert.key'),
            ca: fs.readFileSync('sslcerts/intermediate.crt'),
            cert: fs.readFileSync('sslcerts/cert.crt')
        };
        httpListener = https.createServer(sslOptions, processRequest);
        listenPort = listenSSLPort;
        protocol = "https";
}
catch(error)
{
        console.log("Cannot initialize SSL listener: " + error.message);
}