hacky request limiter example for connect/express

requestlimiter.js

var requestlimit = function(num) { 
    var queue = [];
    return function(req, res, next) {
        queue.push(next);
        var removeAndNext = function() {
            var qindex = queue.indexOf(next);
            if (qindex >= 0) delete queue[qindex]; 
            if (queue.length) queue[0]();
        } 
        var oldresend = res.end;
        res.end = function() { 
               if (!oldresend.apply(this, arguments))
                res.on('drain', removeAndNext)
            else removeAndNext();

        }
        res.on('close', removeAndNext);
        if (queue.length <= num) next();
    }
}

app.use("/url", requestlimit(5))