Node.js response issue during AJAX call

Maybe this seems a really noob question, but I can't figure out what I do wrong. What I want to accomplish is a simple AJAX request. Here is my code on server side:

http.createServer(function(request, response) {
        response.writeHead(200, {
            "Content-Type": "text/html"     
        });
        response.end("No data to return.");

}).listen(8666);

On client side I use jQuery:

$(document).ready(function() {
        $("#magicSend").on("click", function() {
            $.ajax({                   
               url: "http://localhost:8666/",
               type: "POST"
             });
        });
    });

The problem is, that according to Firebug I'm getting the response headers but not the content. The AJAX call also gets red on Firebug's console, although it shows "200 OK". I know I miss something but can't figure out what.