Unable to process same GET request multiple times. How do I get around this?

I'm making a Node.JS app where the user sends commands to a robot. These requests are received from Angular.JS $http.get() requests. This is what the code looks like server side:

app.get('/control/:dir/:amount', function(req, res){
    var dir = req.params.dir.substring(1);
    var amount = req.params.amount.substring(1);
    networking.sendCommand(dir, amount);
});

I know everything is sent properly, but it can only process a certain request once (so no matter how many time localhost:8080/control/forward/100 is sent, it only gets processed once). Is there any way around this?

via bsteven48