gistfile1.txt

http.createServer(dispatchRequest).listen(port);

function dispatchRequest(req, res)
{
        res.sentinel = new Sentinel(function (e) {

                // Like a catch() clause that catches callbacks too.

                // Called if handleRequest throws, or if any of the callbacks
                // registered by handleRequest throw, or if any of the
                // callbacks registered by those callbacks throw, etc.

                res.sendHeader(500, headers);
                res.sendBody('500 Internal Server Error\n\n' + e.stack);

        }, function () {

                // Like a finally clause that runs after all the callbacks,
                // or after the "catch" callback above.

                // Just in case handleRequest didn't manage to arrange
                // for res.finish() to be called. Assumes that
                // calling res.finish() twice has no bad effects.
                res.finish();
        });

        handleRequest(req, res);
}